Howtomakeadollar has frequently discussed money making opportunities related to pets. There are a lot of them. There's the lame, end of the world stolen idea, the related, but not quite the same, MASSIVE SUPERNOVA DESTRUCTION Idea, the Psychic Octopus Idea (Idea over. Octopus dead, Calimari eaten.), and the Flying Animal SuperVacation Idea.
Well, here is another one: http://www.reargearstore.com/
Yep, its a store that sells butt covers for cats and dogs. I'm sorry. Its not butt covers. Its "rear gear." Sometimes you get an idea and you just know its pure gold from the start. This one appears to be brown gold.