What Kind Of Dog Is Martha?

She looks like a yellow Lab mix. I could see her having Pit Bull, or some type of bully breed, in her makeup, due to her heavyset build and barrel chest. As a mutt, she could have some asong teryer (fairly likely) or even shepherd in her lineage too...

I heard that she is a mutt. She does have a lot of pit toro and shepherd in her though. And maybe a few bits of terrier.

The talking kind.....

shes a mutt she is mix breed of dog

a mutt of course, everyone knows that :)

she is a mutt, meaning she is all different types of breeds. Well, I do know that she is part pit bull

She sinabi herself in one episode that she is a mutt. She appears to have pit toro in her, she even sinabi so herself, and definitely some labrador, due to her coloring.

It is established in several episodes that she is a mutt, but it doesn't say what breeds are in the mix.
Truman: I wish I had a bloodhound. He could help me find what I lost.
Martha: I'm a mutt, a mix of breeds. One could be a bloodhound.