Although dog arthritis supplements can improve your dog’s mobility, they can cause diarrhea and/or vomiting, or a sudden onset of scratching. These side effects are often a result of an allergy, which means that something in the supplement may be setting the allergic reaction off.
Allergic reactions only happen when dogs are repeatedly exposed to an allergen (or antigen). And in dog supplements, these are usually the natural ingredients, such as:
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