Not to forget the bigger dogs, I have cotton t-shirts with humorous prints.  These t-shirts are $20- $30 each, with a large range of prints to choose from.

Big Dog Wear

These t-shirts not only come in small dog sizes but also medium, large and x large. I try to have various sizes on hand, but cannot guarantee the style or size at time of visit—I order as required.  I have a good range available.