Jim; I have followed a similar path getting involved in Pet Photography. After some research, I have decided not to get involved in show photography, except to help a fellow photographer with candids and such.

I agree the rescue and SPCA organizations are a wonderful way to help and get experience.

Mostly, I have had the most luck by "word of mouth" and meeting folks with pets. The other day I gave a lady riding a horse one of my post cards; turns out she teaches Dog Obedience School and I have been hired to do Obedience School graduation photos. I plan to do the graduation photos similar to little league team photos; a group photo (dogs plus owners) and an individual photo of each dog. It will not be a huge money maker but will get my name out. The horse rider also works at a local vet. clinic and she will put my post cards there along with photos of her dogs, cats, birds and horses.