I have a friend who is *constantly* taking her animals to the vet. She has 3 dogs and 4 cats and is at the vet at least twice a week. She doesn't seem to cause her animals to become sick but takes them in because they're "acting funny" or something equally as vague. If one of the animals throws up she's off to the vet immediately. I think she sees herself as a very caring pet owner but she can't see that she needlessly subjects her animals to tests, medications, procedures when there's nothing wrong with them. In my opinion the vet is complicit and happy making money off of his best customer.
She has two kids and is overly concerned with their health but not in the crazy way she is about the pets. The kids are lucky!