Sometimes, an underlying health condition in the dog is the result of nutrient absorption in the body having been interfered with, and other times, such vitamin deficiencies in dogs are the result of a poor, unsubstantial or unbalanced diet.

While it seems like a good idea to treat vitamin deficiency in dogs through routinely feeding them additional vitamins, if the proper dosage isn’t known or used, more damage may be done. In fact, an excess of vitamins can create a plethora of other health issues in an animal just as lacking vitamins can.

Preparing to Treat a Dog's Vitamin Deficiency

Always communicate concerns to a veterinarian before diagnosing or attempting to treat your dog yourself, as their perceived vitamin deficiency symptoms could be the result of other underlying issues. Never drastically change your dog's diet without the approval or guidance of a veterinarian or canine nutritionist.

There's a number of most crucial vitamins that all dogs require in their diet, and the four most common vitamin deficiencies in dogs are:

  • Vitamin A (Beta-carotene) deficiency
  • Vitamin D deficiency
  • Vitamin E deficiency
  • Vitamin B2 (Riboflavin) deficiency

Below we'll take a look at all four of these cases, and talk about the most apt treatment.

Remember that when addressing this issue through dietary change, a dog’s stomach can adversely react to completely new foods if they aren't properly introduced. If a change in a dog's typical diet is suggested by a vet, then be sure to change it incrementally over the course of a couple of weeks to a month, depending on the dog’s response to the changes.

6 Reasons Your Dog May be Vitamin Deficient

6 Reasons Your Dog May be Vitamin Deficient

1. Homemade Meals May Not Be Properly Balanced

While a homemade and/or raw dog food diet may be the best option for some dogs, if not properly balanced, an excess of vitamins or lack of vitamins can adversely affect the dog. Additionally, if the dog wasn’t raised on a homemade or raw diet and is introduced to it suddenly, this can cause stomach issues and even shock and stress for the animal.

Whether cooked meats and vegetables or uncooked ones, the dog's diet should have a sufficient supply of animal protein source with a small amount of wide variety of whole grains, vegetables, and healthy fats. Proper numbers should also be followed.

Another potential issue for home cooked dog food meals is that the nutritional value of many nutrient and mineral rich foods dissipates when heated (source). Dogs normally not fed a raw diet should receive some raw veggies from time to time. Lightly seared meats that are safe when eaten on the rarer side, such as beef, should be added to the diet often.

2. Poor Quality Canned or Poorly Packaged Dog Food

Dogs fed pre-packaged commercial dog foods that are of lower quality and lacking in nutritional content may experience symptoms linking them to vitamin or mineral deficiencies.

While it’s true that many dog foods advertise and are, indeed, “packed” with vitamins, minerals and other essential nutrients, many of them are synthetic. Absorption of such synthetic nutrients will not be as efficient. While there's not enough studies with dogs on this, plenty of human trials showed that synthetically added vitamins and minerals are not as well absorbed (here and here).

High quality dog food brands are less likely to have this problem. Alternatively, if feeding a cheaper dog food brand, you can also feed your pet a few fresh, home-created meals once a week to supplement your dog's usual diet of kibble and/or wet food.

3. No Routine Observation of Daily Food Intake

Dogs who spend most of their time outdoors or whose food bowls aren’t somewhere that’s routinely visited in the household may not be eating enough or they may be eating too much.

Pet owners must always pay attention not only to what type of foods they're feeding dogs, but also how and when a dog consumes said meals. Regularly observing your dog and weighing them will also help in noticing any issues early on.

4. Response to Certain Medications

Some medications can affect the balance of vitamins in the dog's body. For example, medications that help with common issues in dogs, such as seizures, glucose levels (diabetes), and several forms of steroids which help with anything from allergies to inflammation may affect Vitamin D levels, studies show.

Most veterinarians are aware of these side effects and will mention if this issue exists when prescribing something. This is why it's crucial to consult with a vet before giving your dog any drugs or supplements – their health history needs to be considered.

5. Parasitic Infection

Even the most commonly occurring parasites can affect a dog's ability to absorb nutrients if they are infected. For example, tapeworms and ringworms live off a dog’s health and whatever the dog consumes, stealing nutrients from them. This causes not only vitamin deficiencies in dogs but can also cause malnutrition. This is more common in strays or abandoned canines than domestic pet dogs.

6. Medical Conditions

Other health maladies such as anemia or diabetes are known for both causing and being the result of nutritional irregularities in dogs. Your pet's veterinarian will run appropriate tests to rule out medical conditions such as these and develop a plan on how to best fix your dog's vitamin deficiency while considering all current health issues.

RELATED: How to Give a Dog Medicine and Vitamins

How to Treat to Vitamin Deficiencies in Dogs

How to Treat to Vitamin Deficiencies in Dogs

After a visit to the vet reveals your dog having a vitamin deficiency, you’ll leave with a greater understanding of not only how your pooch was affected by this but also how to correct the issue, and how to prevent it in the future.

It’s likely your veterinarian will recommend a prescription medication to get the dog’s vitamin levels back to where they should be. While this can be a good start, the treatment is continued by the pet owner at home by supplementing a dog’s diet. Note that vitamin-excess is just as much of a threat, with Vitamin D and Vitamin A being the most common suspects.

To avoid vitamin toxicity in dogs, follow this basic rule of thumb:

1 milligrams (of vitamin) per pound (of dog)

Please keep in mind that if your lifestyle or budget prove to make building your dog’s diet too difficult or not possible, there are several “all-in-one” vitamins on the market that are specifically designed with canines in mind.

Some of the most recommended multivitamins for dogs you can try:

Depending on the age and weight of your dog, one to four of these treat-like vitamins will help them stay healthy. Below are some of the most common dog vitamin deficiencies and pet supplements that are available as a correct and effective response to the disorder.

4 Most Common Vitamin Deficiencies in Dogs

Beta-Carotene Deficiency in Dogs

1. Beta-Carotene Deficiency


If your dog is lacking Vitamin A, you can supplement their diet with egg yolks, liver, liver oil, or even veggies (kale, carrots, pumpkins, and sweet potatoes). While liver oil, especially from fish, can be quite pricey, your local butcher’s shop is likely to have an affordable selection of beef or poultry livers when you’re in a pinch.

If your dog is acclimated to digesting raw foods, you may choose to serve the liver raw. However, lightly cooking or even boiling it is also acceptable and recommended if your pet has never been given raw meat.

Please note that liver is so rich in Vitamin A and other nutrients that it can cause adverse reactions in dogs if they’re given too much, including joint tenderness and swelling and dehydration. Animal care professionals recommend giving your dog just a few nibbles at first and waiting to see how it affects their demeanor and stool consistency. If their stool remains solid and healthy, then you can feed them liver once a day.

A good rule to follow:

  • 5 ounces to dogs 80 pounds or more
  • 1 ounce to dogs between 40 and 80 pounds
  • 5 ounce to dogs 40 pounds or less

Vitamin D Deficiency in Dogs

2. Vitamin D Deficiency


Vitamin D is a fat-soluble nutrient, which could equate to toxicity in dogs if given too much Vitamin D. In fact, many veterinarians find not so much a deficiency in this vitamin but an excess, with canine patients coming into their office with a loss of appetite, a case of vomiting, and excessive drooling. There's even been a recent massive dog food recall by the FDA of many brands, all due to excessive levels of Vitamin D.

While many food items that help with Vitamin A deficiency will also help with Vitamin D deficiency (egg yolks, fatty meats, and fish), it’s important to not double the quantity of these items unless your dog is especially active and is a larger breed.

Instead, you may want to look into Vitamin D supplements for dogs. You may choose to ask your vet for a better recommendation. Exploring these options will help you avoid inadvertently poisoning your furry friend by using improper brands or dosage.

Vitamin E Deficiency in Dogs

3. Vitamin E Deficiency


Vitamin E is a great additive for boosting the immune system and promoting healthy skin and coat in dogs. Vitamin E is also an antioxidant and plays a key role in cell development and strength. A great and essential supplement to your dog’s daily meal, Vitamin E is also unlikely to cause adverse effects if your pet happens to be given too much, unlike Vitamin D.

However, this doesn’t mean you shouldn’t carefully craft your dog's meal or give them a bottle of Vitamin E and let them gobble up every pill. Fatty oils and nuts are a great resource for this vitamin. Most professional recommend sunflower oil, soybean oil, or peanut butter.

Be careful with peanut butter – some are packed with sugars; look for natural peanut butters (where peanuts is the only ingredient) or visit your local health foods store and ask if they have a nut grinder, which allows you to grind up and make your own peanut butter in store.

Avoid avocados. Although a healthy fat, many dogs have a sensitivity to it and it may cause a toxic reaction in others. Instead, fatten up their diet with almond butter or peanut butter, or any other acceptable human foods that are high in Vitamin E.

Riboflavin Deficiency in Dogs

4. Riboflavin Deficiency


Riboflavin, or Vitamin B2, is responsible for helping produce red blood cells, which deliver oxygen to different systems of the dog's body. Vitamin B2 is also a valuable resource for the metabolism, aiding the body in processing foods and transforming them into energy.

If your dog is younger or particularly active, riboflavin is an extremely important additive to their meals. To supplement your canine companion’s diet with riboflavin, don’t skimp on healthy meats: beef, poultry or fish. Leafy greens, healthy grains, and live-culture, sugarless yogurts are all great food additives for any canine suffering from riboflavin deficiency. Additionally, several fresh herbs are an ideal resource as well: sage, chamomile, peppermint, and raspberry leaves.

Deficiencies in B6 and B12 may also occur in dogs. As two other members of the water-soluble B vitamins, B6 and B12 are vital in maintaining a dog’s healthy metabolism. To prevent or fix that, include delicious meats in your dog’s diet as well as sugarless peanut butter and mashed or chopped sweet potatoes.

If your vet noted a Vitamin B deficiency in a dog: when building their meal plate, meat should take a majority of the portion, with vegetables in a close second, and any fatty goods (sweet potatoes, peanut butter) just a small dollop or sliver.

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Most Common Vitamin Deficiencies in Dogs