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Dewormer Side Effects in Dogs

Posted on | February 9, 2010 | No Comments

Vomiting and diarrhea are the most common side effects of deworming a dog. That’s because the drugs that is poisonous to intestinal parasites are also strong enough to upset a dog‘s digestive system. In most cases, these effects are mild and don’t last very long. A dog being dewormed also may show signs of lethargy and be uninterested in food. The dog will recover its appetite once the deworming medication passes from its system.

However, if a dog is heavily infested with worms, the animal can develop a fecal impaction as dead or dying worms clog its lower intestines. This effect is seen more often in toy breeds, but it requires immediate care by a veterinarian.

Some dogs also may be allergic to deworming drugs. Thankfully, allergies to the drugs, known as anthelmintics, are rare.

Deworming drugs often paralyze intestinal parasites so that they drop off the walls of the intestines. As a result, live worms can sometimes be seen in the stool of a dog that’s being dewormed. The worms soon die once outside of the dog.

Be sure to give the dog the proper dose of de-worming medicine. Most dewormer doses are measured according to the dog’s weight. If the dog shows drooling, twitching, staggering, weakness, head pressing or paralysis after getting dewormers, it may have been overdosed. Take the dog to the vet immediately is these symptoms appear.


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