Gophers don't have to be rabid to do this. They're just feisty.
"Although they attempt to flee when threatened, they may attack other animals, including cats and humans, and can inflict serious bites with their long, sharp teeth."
The one in the picture is a Botta's or valley pocket gopher (Thomomys bottae). This species of gopher prevents wear on its claws in our heavy clay soil by digging with its teeth.
Thanks to Randy_B for the gopher links and accompanying text.
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