It's very expensive for a drug manufacturer to go through the process of getting a drug approved and available to sell for animal species. The manufacturer may speculate that they won't make much money from a drug, and perhaps not enough to justify going through the expensive and complex drug approval process.

Eric Weigand - Owner - CLAREMONT VETERINARY HOSPITAL Inc.

But pet owners can find quality care in Mexico, he said. They just need to do their research and make sure the clinic they're working with is legitimate. "They can trust that veterinarians in Mexico can help them and offer the same services, just on a lower cost," he said.

A veterinary physician, colloquially called a vet, shortened from veterinarian or veterinary surgeon, is a professional who practices veterinary medicine by treating disease, disorder, and injury in non-human animals.