Kim,
I was referring to "pet photography" as a form of business and not just a photographic subject. I can take lovely sunrise and sunset photos but in order for me to sell them, I'd have to get a lot more technically competent as well as creative -- kinda like Roman who creates outstanding landscape and fine art images.

In the business of "pet photography" most people are willing to pay for formal or informal portraits. You might even be able to get someone to pay for candids of your dog running on the beach or in a dog park. But the portraits require more sophisticated posing and baiting techniques than simply capturing the moment.

Jim