Catchy domains with either a badass presell or redirect to the offer itself. If it were me I would definitely try the presell first.
Traffic: Pet/Animal Magazines
Sometimes when you're on the interwebz for so long, excellent sources or out of the box traffic ideas go unnoticed.
Here's another idea for the offer but actually the pet vertical in itself. It's actually more wider than most affiliates are willing to go but this idea has been developed by one smart motherfucker I met at Boston. In the case of pets create a pet related social network or even something easier like a pet photo upload site. Of course people have to register to use it. This registration opens a ton of ideas to connect/contact these people with pedipaws or whatever pet shit you want to pawn on them. Oh and then of course have your ad rotating system going on.
Very brief and general and probably more work than most affiliates want to put forth but then again you need to ask yourself, "What the fuck have I done" " How well did it work".
Knowing the pet industry is huge and the amount of replies here showing fails it's time to go extreme and try out some shit that nobody else is willing to try.
PS - I've never known the offer to be profitable either.