This is an iconic Big Dogs tee from the 90s. There's a small Big Dogs logo on the front chest and a large back graphic with trees, a dog, and the text- Make A Dog Happy, Save A Tree! It's white cotton, made in the USA, with short sleeves and crew neck.
 
Pre-owned, used; SOLD AS IS. The tee has a small hole at one underarm and at the neck/shoulder. 
 
Marked as size L; actual tee measures are--
Pit to pit- 21 1/2"
Center front length- 24"