do you mean a family picture or just Riley? We are doing the same thing but with me, my bf, and Lily. I am just decorating the fireplace and having a little family pic there and getting them done on cards hehe. Anyway, in the malls near me there is a photo place called "Picture People" and I know they do pets. My sisters and I got a portrait done and it wasn't too expensive. The link to the website is below, maybe they have a place around you? Goodluck
http://www.picturepeople.com/
**and I forgot to mention that they usually have in-store specials so that is another reason we got ours at a good price