About T-Shirt Design
You do not have to think too hard about It was me, I let the Dogs Out Mens T Shirts. The joke is right there and it gets the point across fast. It fits really well with dog lovers, but you do not have to be obsessed with that stuff to enjoy the joke.
You could wear it for casual days, bring it out for birthdays, or just keep it in the normal shirt rotation. It has the relaxed feel people usually want from novelty shirts without getting too complicated.
The design is easy to get, easy to gift, and easy to wear without overthinking it.