My BF's Siamese is about 18 and a real pain in the ass. The damn thing can't even see and shits on the floor.

I'm not mean to it, and don't want it to feel any pain. But I know my BF won't take her to the vet, ever. I don't want to spend the money myself. He won't because he will just wait for the stupid thing to keel over.

I would like to get rid of it while he's a work and then tell him the thing just went to sleep and didn't wake up.