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When you have no idea what kind of dog you have so you just guess.

Guessing all the dog breeds that make up a mutt.

Dog has so many breeds in it that it makes a new breed called Guessamutt.
(It's easier than listing the 8 dogs he looks like)
What kind of dog is that?

Oh, he's a Guessamutt.
by Valcation May 20, 2018
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