If you are up to opening your own business you could open a dog walking business. My husband and I did it for a couple of years and made some decent money. It was a very enjoyable job and one we never minded getting up in the morning to do.
-Pet food companies
Vet, Dog trainer, Dog groomer, or working at a Dog spa.... people will pay for anything for their dogs...
veterinarian, animal behaviorist, or you could work in a doggy day care center
dog trainer for the police, you have to be good though