Three dogs are in the vet's waiting room. Dogs being dogs, they get to talking and ask each other why they're there.
1st dog: I'm a chewer. I looove to chew. I'll chew anything anytime anywhere. The other day I chewed up some of my master's important papers, so I'm here to get neutered.
2nd dog: I'm a digger. I looove to dig. I'll dig anything anytime anywhere. The other day I dug up my master's new carpet, so I'm here to get neutered.
3rd dog: I'm a humper. I looove to hump. I'll hump anything anytime anywhere. The other day when my mistress got out of the shower she bent over to dry her feet and, well, I just couldn't help myself.
1st dog: So are you here to get neutered?
3rd dog: Nah, I'm here to get my nails clipped.