Thanks, everyone, for your comments! I appreciate all the dog-love, and thanks, Chris987, for offering something for the cat-lovers, too! I'm glad to hear the design is a hit.
Yes, Bijou, there is a Westie! And Collette, it looks like a Maltese to me.
Skylurker, there is no Yorkie, alas, since all the dogs pictured are black or white.
Maneera, I love your idea of a shift dress. Now I want to get into my sewing room and work on that one! I have another fabric that will coordinate, so I could use the dog portraits judiciously. I like the dress idea, because it's not another t-shirt. I don't know how many dog t-shirts I need. (though I see there is some demand for them here. I'm not ready to go into business--too many other things I want to make.)