About T-Shirt Design
A shirt does not need a giant explanation to be funny, and If Dogs Could Talk I'd Have No Reason For People T-Shirt proves that. It fits really well with dog lovers, but you do not have to be obsessed with that stuff to enjoy the joke.
It works for casual days and birthdays, but it is also the kind of shirt someone could wear whenever they feel like it. People who buy t shirts for the joke as much as the shirt itself will probably get what this design is going for.
This is the kind of idea that works well on novelty shirts because you can understand it right away. The design is easy to get, easy to gift, and easy to wear without overthinking it.