Vitamin toxicity sounds strange – aren’t vitamins good for dogs? Yes, they are but only in doses recommended for their body weight. Dosing higher then the recommended levels is called over supplementation and can happen in several ways. The most common is for an owner to accidentally give their dog a vitamin dosed for an adult not realizing that there is a big difference between a 150-pound human and a twenty-pound dog. The next most common is the canine vacuum – a dog eats a vitamin found on the floor. Other common causes are eating rat poison that contains cholecalciferol, ingesting plants including Day Jassmine (Cestrum diurnum), owners over supplementing food with too much fish oil, brewer’s yeast, liver, or other highly concentrated foods.
Symptoms are dependent on what vitamin is over supplemented but can range from lethargy, anorexia, weight loss, front leg limping, stiffness, and constipation in vitamin A over supplementation to vomiting, diarrhea, excessive drinking and urinating, abnormal bleeding or bruising, abnormal heart rhythms, limping and pain.
In most cases of over supplementation, pets are presented to their vet for one of the symptoms and the vet must go through a series of blood test, x-rays and serum test to discover the cause. In the case of acute over supplementation, (the dog eats the contents of a bottle of fish oil capsules), the treatment is the same for any poisoning – the vet induces vomiting, activated charcoal is administered to bind the toxin and prevent absorption and medication and treatment is administered to ease or stop additional symptoms.
The easiest treatment is prevention. Always keep vitamins and supplements away from pets and watch that you do not drop any accidentally. Always ask your vet about dosing recommendations and if it is even required. There are vitamins for dogs specifically formulated for their smaller size and needs.
Over supplementation is surprisingly common and if your dog begins to show any unusual symptoms, be sure to inform your vet if you give your pet supplements even if you are sure they are within allowable levels – again, better safe then sorry.

Moldy Food
Hi Ann,
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