I also work PT at a school for special needs in a therapeutic horseback riding program and take care or other various barn animals (pigs, goats, horses, rabbits). It's a very rewarding job.
I started my business 10 years ago, but I have been pet sitting for over 20 years. I own a Dachshund and a JRT. They are like my children. I enjoy working with my four legged friends because it doesn't seem like it's work and they seem to keep it interesting and fun.