Do dogs need vitamins? What does the science say?
7/17/2026 | Written by Dilber Hussain | Advised by Evan Antin
As a pet parent, you may wonder on what should be included in your dog's diet apart from commercially formulated feed. When you are providing an AAFCO-certified balanced and complete meal, there is generally no need to add vitamin supplements, but this is not for all dogs and pets; this decision should be taken after thorough veterinary examination and feed evaluation. It is your responsibility to provide good feed, exercise opportunities, and a comfortable and cozy resting and sleeping place for dogs that you love being with you. Vitamin supplements are crucial for bone growth and joint health, skin and coat condition, and overall health. If a diet is lacking any one vitamin, that will lead to deficiency diseases. At the same time, if you are providing an excess amount of vitamins, it might cause toxicity in them.
Dog vitamins
Vitamins are organic substances that are not produced in the body and must be included in the diet for normal physiological functioning.
Dog vitamins are a type of nutritional supplement used to provide nutrients and help certain bodily functions. It's estimated that up to 33% of dogs are on a supplement or vitamin product in addition to their regular diet, according to some studies.
Vitamins give an extra boost of an organic compound that might already be in your pet's food that is needed for the body's normal metabolism. These nutrients are very necessary for a healthy immune system, digestive system, and nervous system, and they can play a pivotal role in preventing and treating certain diseases.
Vitamin and supplement use in dogs is on the rise, but it's of utmost importance to speak to your veterinarian before adding them to your dog's health regimen to ensure they are safe for your pet.
What vitamins are needed for dogs
Multivitamins containing many vitamins, such as B-complex and B-12, are generally used in veterinary medicine.
What vitamins and supplements your dog needs depends on many factors, such as age, lifestyle, diet, and health conditions.
Fortunately, with most commercial pet foods, AAFCO sets standards for labeling and nutritional requirements to make sure they provide the vitamins and nutrients your dog needs to be healthy.
You can find the AAFCO statement list on those foods that have been evaluated, and it will let you know which life stage the diet is made for: puppy, adult, or senior.
If your dog's diet has the AAFCO labeling, then it has everything they need, and multivitamins are not required.
Multivitamins are needed for specially formulated, home-cooked diets that are made for dogs with specific health concerns.
Advantages of vitamins
Multivitamins help fulfill the dietary requirements of vitamins if they are lacking in the diet, vitamins needed for joint health and mobility. When you are providing your dog a home-cooked diet, then there should be vitamin supplements added to the diet to avoid deficiency. Vitamin E capsules are used for skin issues in dogs; dogs with vision problems should be given vitamin A.
Vitamin B12 is often recommended for dogs with inflammatory bowel disease, as they often have low blood levels from not absorbing the vitamin directly from the diet. A B12 deficiency in dogs can lead to various health problems, including lethargy, loss of appetite, weight loss, poor coat quality, and even neurological signs.
Before adding any vitamins to their diet, consultation with a veterinarian is a must; otherwise, it will cause complications and toxicities.
Side effects of vitamin supplements
The risks of dogs taking vitamins are often limited to the side effects they might cause.
Gastrointestinal problems such as vomiting, nausea, diarrhea, and decrease in appetite are among the most common side effects of giving vitamins to dogs.
Hypersensitivity and allergies can occur to any vitamin supplement and are usually not predicted unless your dog has had a reaction to similar ingredients in the past.
Vitamins can also have interactions with any medications your dog might already be on, so it's important to check with your vet before giving your pup anything new.
It's important that all vitamin supplements used for dogs are specifically labeled for canine use.
Human vitamins might contain the same ingredients, but the amounts are vastly different.
When vitamins are recommended
Dog vitamins and supplements are given to help boost their health and provide support for any ongoing medical issues. Itchy skin and inflammation from allergies often improve with omega-3 fatty acids, as they contribute to the skin's moisture barrier, which reduces inflammation and helps to promote a shiny, healthy coat.
In general, vets do not recommend multivitamins for dogs unless there is a specific medical condition causing your dog's body to not properly use the minerals and vitamins in their diet.
Other supplements, such as glucosamine and omega-3 fatty acids, are commonly recommended by vets for prevention and treatment of a variety of medical conditions.
Conclusion
In general when you provide your dog commercially formulated feed approved by AAFCO with labeling containing a list of all the ingredients, then the vitamin requirement is fulfilled without the need to supplement further. But on the other hand, if your dog is on homemade food, then it is necessary to add the missing vitamin by consulting with a pet nutritionist and veterinary expert. Before adding anything to the diet, it is advised to get approval and a green signal from the veterinarian in order to have better results and avoid toxicity-related problems.