depends.
of course it has to be a beautiful dog.
my dog, Angus, an english bulldog is in canadian commercials.
really you just have to get very good photos of your dog.
(try getting a professional to take the photos)
make a resume, with all the commands your dog knows. as well as the obvious stuff, like name birth date, vaccinations, and any other health concerns.
after you just have to find a local place, where they will do auditions for animals. send them your resume. of course you will want to find more than one, so send your resume to as many places as you can, then if your dog is right for the job the will call you.
