Thanks everyone! I try to paint them as realistic as possible and usually do commissioned ones. My vet actually got me into painting the rocks. She had a client who lost a pet and wanted a permanent marker for their garden. I had never painted on rocks before, so I used my very willing cat Indy to pose for one and used some special paints that are for painting porches, flower pots, etc. and found that I really enjoyed painting rocks. The one I posted on this thread is named Powder and lives at my vets office.
Tuckervil: I am still trying to put together a website, but if anyone is interested just PM me and I will give you my phone and contact info. I will post a pic of one of the dogs I have done and Indy when I get home tonight.
The garden supply place where I select my rocks is amazed when I tell them that they will be dogs, cats birds, turtles, etc.!