Veterinary Pet Care - Dog Health | Cat Health | Dog Care | Cat Care

Pet Diabetes

What is diabetes mellitus?

Diabetes mellitus is frequently diagnosed in pets five years of age or older. This is also known as Type II or adult-onset diabetes.

There is a congenital form that occurs in puppies called Type I or juvenile diabetes, but this is rare in dogs.

Description

Diabetes mellitus is a disease of the pancreas. This is a small but vital organ that is located near the stomach. It has two significant populations of cells. One group of cells produces the enzymes necessary for proper digestion. The other group, called beta-cells, produces the hormone insulin. Simply put, diabetes mellitus is a failure of the pancreas to regulate blood sugar.

Type I or Insulin Dependent Diabetes Mellitus, results from total or near-complete destruction of the beta-cells. This is the most common type of diabetes in dogs and cats. As the name implies, pets with this type of diabetes require insulin injections to stabilize blood sugar.

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Type II or Non-Insulin Dependent Diabetes Mellitus, is different because some insulin-producing cells remain. However, the amount produced is insufficient, there is a delayed response in secreting it, and the tissues of the pets's body are relatively resistant to it. Type II most commonly occurs in older obese cats and dogs. People with this form may be treated with an oral drug that stimulates the remaining functional cells to produce or release insulin in an adequate amount to normalize blood sugar. Unfortunately, pets do not respond well to these oral medications.

Insulin

The role of insulin is much like that of a gatekeeper: it stands at the surface of body cells and opens the door, allowing glucose to leave the blood stream and pass inside the cells. Glucose is a vital substance that provides much of the energy needed for life, and it must work inside the cells. Without an adequate amount of insulin, glucose is unable to get into the cells. It accumulates in the blood, setting in motion a series of events that can ultimately prove fatal.

When insulin is deficient, the cells become starved for a source of energy. In response to this, the body starts breaking down stores of fat and protein to use as alternative energy sources. As a consequence, your pet eats more; thus, we have weight loss in a pet with a ravenous appetite. The body tries to eliminate the excess glucose by excreting it in the urine. However, glucose (blood sugar) attracts water resulting in the production of a large amount of urine. To avoid dehydration, the pet drinks more and more water.

Signs

1. Weight loss

2. Increased water consumption

3. Increased appetite

4. Increased urination

Diagnosis

The diagnosis of diabetes mellitus is based on three criteria: the four classical clinical signs, the presence of a persistently high level of glucose in the blood stream, and the presence of glucose in the urine.

The normal level of glucose in the blood is 80-120 mg/dl (4.4-6.6 mmol/L). It may rise to 250-300 mg/dl (13.6-16.5 mmol/L) following a meal. However, diabetes is the only common disease that will cause the blood glucose level to rise above 400 mg/dl (22 mmol/L). Some diabetic pets will have a glucose level as high as 800 mg/dl (44 mmol/L), although most will be in the range of 400-600 mg/dl (22-33 mmol/L).

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To keep the body from losing glucose, the kidneys do not allow glucose to be filtered out of the blood stream until an excessive level is reached. This means that pets with a normal blood glucose level will not have glucose in the urine. Diabetic dogs and cats, however, have excessive amounts of glucose in the blood, so it will be present in the urine.

Treatment almost always requires some dietary changes and administration of insulin.

Initially, your pet may be hospitalized for a few days to deal with the immediate crisis and to begin the regulation process. The "immediate crisis" is only great if your pet is so sick that it has quit eating and drinking for several days. Pets in this state, called ketoacidosis, may require hospitalization with quite a bit of laboratory testing. Otherwise, the initial hospitalization may be only for a day or two for basic tests and to begin treatment. At that point, your pet goes home for you to administer medication. At first, return visits are required every 3-7 days to monitor progress. It may take a month or more to achieve good regulation.

Your personal commitment to treating your pet is very important in maintaining regulation and preventing crises. Most diabetic pets require insulin injections once or twice daily. They must be fed the same food in the same amount on the same schedule every day. If you are out of town, your pet must receive proper treatment while you are gone. These factors should be considered carefully when your pet has been diagnosed with diabetes mellitus.

TREATMENT

SOLUTIONS

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Consistency is vital to proper management of the diabetic dog. Your pet needs consistent administration of medication, consistent feeding, and a stable, stress-free lifestyle. To best achieve this, it is preferred that your pet live indoors most of the time. Although that is not essential, indoor living removes many uncontrollable variables that can disrupt regulation.

Diet

The first step in treatment is to alter your pet's diet.

For Cats, this is of utmost importance. In my practice, 50% of cats are able to come of of insulin after being on the diabetic diet. Recent studies have shown that cats benefit greatly from higher protein, lower carbohydrate diets. These resemble diets that they would eat in the wild. Purina and Hills now make specific feline diabetic diets. You can also purchase canned food that fits this requirement at the grocery store. Specifically go for the kitten food: an example is Friskies canned tuna which is very high in protein and low in carbohydrates. The other option is to make a home-made diet.

FOR DOGS, Diets high in fiber are preferred because they are generally lower in sugar and slower to be digested. This means that the dog does not have to process a large amount of sugar at one time. Additionally, the fiber may help stimulate insulin secretion in Type II diabetes.

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Your pet's feeding routine is also important. The preferred way is to feed twice daily, just before each insulin injection. If your pet is currently eating on a free choice basis, it is important to try and make the change. If a two-meals-per-day feeding routine will not work for you, it is still important to find some way to accurately measure the amount of food that is consumed.

Insulin Injections

Many people are initially fearful of giving insulin injections. If this is your initial reaction, consider these points:

A. Insulin does not cause pain when it is injected.

B. The injections are made with very tiny needles that your pet hardly feels.

C. The injections are given just under the skin in areas in which it is almost impossible to cause damage to any vital organ.

Please do not decide whether to treat your pet with insulin until we have demonstrated the injection technique. You will be pleasantly surprised at how easy it is and how well your pet tolerates the injections.

The injection technique is as follows:

Insulin Information. Insulin comes in an airtight bottle that is labeled with the insulin type and the concentration. It is important to make sure you match the insulin concentration with the proper insulin needles. Most dogs receive U-100 insulin. Make sure that the insulin needles you use are designed for your pet's insulin.

Before using the insulin, mix the contents. Be sure to roll it gently between your hands, not shake it. The reason for this is to prevent foam formation, which will make accurate measuring difficult. Some types of insulin used in pets have a strong tendency to settle out of suspension. If it is not shaken properly, it will not mix well and dosing will be inaccurate. Therefore, the trick is to shake it vigorously enough to mix it without creating foam. When you have finished mixing the insulin, turn the bottle upside down to see if any white powder adheres to the bottom of the bottle. If so, more shaking is needed.

Insulin is a hormone that will lose its effectiveness if exposed to direct sunlight or high temperatures. It should be kept in the refrigerator, but it should not be frozen. If you have any question about your pet's insulin and how it was stored, we recommend replacing it instead of risking using ineffective insulin. Insulin is safe as long as it is used as directed, but it should be kept out of the reach of children.

Drawing up the Insulin. Have the needle and syringe, insulin bottle, and dog ready. Then, follow these steps:

1. Remove the guard from the needle, and draw back the plunger to the appropriate dose level.

2. Carefully insert the needle into the insulin bottle.

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3. Inject air into the bottle. This prevents a vacuum from forming within the bottle.

4. Withdraw the correct amount of insulin into the syringe.

Before injecting your pet with the insulin, check that there are no air bubbles in the syringe. If you get an air bubble, draw twice as much insulin into the syringe as you need. Then withdraw the needle from the insulin bottle and tap the barrel of the syringe with your fingernail to make the air bubble rise to the nozzle of the syringe. Gently and slowly expel the air bubble by moving the plunger upward.

When this has been done, check that you have the correct amount of insulin in the syringe. The correct dose of insulin can be assured if you measure from the needle end, or "0" on the syringe barrel, to the end of the plunger nearest the needle.

Injecting the Insulin.

The steps to follow for injecting insulin are:

1. Hold the syringe in your right hand (switch hands if you are left-handed).

2. Have someone hold your pet while you pick up a fold of skin from somewhere along your dog's back in the "scruff" region with your free hand. Try to pick up a different spot each day.

3. Quickly push the very sharp, very thin needle through your pet's skin. This should be easy and painless. However, take care to push the needle through only one layer of skin and not into your finger or through two layers of skin. The latter will result in injecting the insulin onto your dog's haircoat or onto the floor. The needle should be directed parallel to the backbone or angled slightly downward.

4. To inject the insulin, place your thumb on the plunger and push it all the way into the syringe barrel.

5. Withdraw the needle from your pet's skin. Immediately place the needle guard over the needle and discard the needle and syringe.

6. Stroke your pet to reward it for sitting quietly.

7. Be aware that some communities have strict rules about disposal of medical waste material so don't throw the needle and syringe into the trash until you know if this is permissible. If it is not, we can dispose of them for you.

It is neither necessary nor desirable to swab the skin with alcohol to "sterilize" it. There are four reasons:

1. Due to the nature of the thick hair coat and the type of bacteria that live near the skin of pets, brief swabbing with alcohol or any other antiseptic is not effective.

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2. Because a small amount of alcohol can be carried through the skin by the needle, it may actually carry bacteria with it into the skin.

3. The sting caused by the alcohol can make your dog dislike the injections.

4. If you have accidentally injected the insulin on the surface of the skin, you will not know it. If you do not use alcohol and the skin or hair is wet following an injection, the injection was not done properly.

5. Although the above procedures may at first seem complicated and somewhat overwhelming, they will very quickly become second nature. Your pet will soon learn that once or twice each day it has to sit still for a few minutes. In most cases, a reward of stroking results in a fully cooperative dog that eventually may not even need to be held.

Monitoring

It is necessary that your pet's progress be checked on a regular basis. Monitoring is a joint project on which owners and veterinarians must work together.

Home Monitoring

Your part consists of two types of monitoring. First, you need to be constantly aware of your pet's appetite, weight, water consumption, and urine output. You should be feeding a consistent amount of food each day, which will allow you to be aware of days that your pet does not eat all of it or is unusually hungry after the feeding. You should weigh your pet at least monthly. It is best to use the same scales each time.

You should develop a way to measure water consumption. Since this is highly variable from one pet to another, keeping a record of your dog's water consumption for a few weeks will allow you to establish what is normal for your pet. Another way to measure water consumption is based on the number of times it drinks each day. When properly regulated, it should drink no more than six times per day. If this is exceeded, you should take steps to make an actual measurement.

Any significant change in your pet's food intake, weight, water intake, or urine output is an indicator that the diabetes is not well controlled. We should see your pet at that time for blood testing.

The second method of home monitoring is to determine the presence of glucose in the urine. If your pet is properly regulated, there should be no glucose present in the urine.

There are several ways to detect glucose in urine. You may purchase urine glucose test strips in any pharmacy. They are designed for use in humans with diabetes, but they also work in dogs and cats. A fresh urine sample should be collected and tested with the test strip. If glucose is detected, the test should be repeated the next two days. If it is present each time, we should see your pet for a blood test.

Monitoring of Blood

There are two blood tests that can be used to monitor your dog. One of these should be performed about every 3-4 months if your pet seems to be well regulated. Testing should also be done at any time the clinical signs of diabetes are present or if glucose is detected in the urine for two consecutive days.

Determining the level of glucose in the blood is the most commonly used blood test. Timing is important when the blood glucose is determined. Since eating will elevate the blood sugar for several hours, it is best to test the blood at least 6 hours after eating.

When testing the blood we want to know the highest and lowest glucose readings for the day. The highest blood sugar reading should occur just before an injection of insulin is given. The lowest should occur at the time of peak insulin effect. This is usually 5-8 hours after an insulin injection, but it should have been determined during the initial regulation process. Therefore, the proper procedure is as follows:

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1. Feed your pet its normal morning meal then bring it to the hospital immediately. If you cannot get it to the hospital within 30 minutes, do not feed it. In that situation, bring its food with you.

2. Bring your pet to the hospital early in the morning before giving it insulin.

3. A blood sample will be taken immediately and then we will give insulin and feed your pet if it did not eat at home.

4. A second blood sample will be taken at the time of peak insulin effect.

If your pet gets excited or very nervous when riding in the car or being in the hospital, the glucose readings may be falsely elevated. If this occurs, it is best to admit your pet to the hospital the morning (or afternoon) before testing so it can settle down for testing the next day. Otherwise, the tests give us limited information.

The alternative test is called a fructosamine test. This test is an average of the blood glucose levels for the last two weeks. It is less influenced by stress and inconsistencies in diet and exercise. For some pets, this is the preferred test. It does not require fasting and can be performed at any time of the day.

Low Blood Sugar

Hypoglycemia means low blood sugar. If it is below 40 mg/dl, it can be life threatening. Hypoglycemia occurs under two conditions:

1. If the insulin dose is too high. Although most pets will require the same dose of insulin for long periods of time, it is possible for the pet's insulin requirements to change. However, the most common causes for change are a reduction in food intake and an increase in exercise or activity. The reason for feeding before the insulin injection is for the purpose of knowing when the appetite changes. If your pet does not eat, skip that dose of insulin. If only half of the food is eaten just give a half dose of insulin. Always remember that it is better for the blood sugar to be too high than too low.

2. If too much insulin is given. This can occur because the insulin was not properly measured in the syringe or because two doses were given. You may forget that you gave it and repeat it, or two people in the family may each give a dose. A chart to record insulin administration will help to prevent the dog being treated twice.

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The most likely time that a pet will become hypoglycemic is the time of peak insulin effect (5-8 hours after an insulin injection). When the blood glucose is only mildly low, your pet will be very tired and unresponsive. You may call it and get no response. Within a few hours, the blood glucose will rise, and your pet will return to normal. Since many dogs and cats sleep a lot during the day, this important sign is easily missed. Watch for it. It is the first sign of impending problems. If you see it, please bring your pet in for blood testing.

If your pet is slow to recover from this period of lethargy, you should give it corn syrup (1 tablespoon by mouth). If there is no response in 15 minutes, repeat the corn syrup. If there is still no response, contact us immediately for further instructions.

If severe hypoglycemia occurs, dogs and cats will have seizures or lose consciousness. Ultimately, untreated hypoglycemia will lead to coma and death. This is an emergency that can only be reversed with intravenous administration of glucose. If it occurs, come to your veterinarian immediately.




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