We had that problem in spades. Here in AZ, it is the round-tailed ground squirrel. They're small, look and act like miniature prairie dogs, and they dig an underground city, so you can step on what is apparently solid ground and your leg sinks in, leading to sprained ankles. Our property is 6 acres and was overrun with them.
Then, along came Huck. Huck was a GSD rescue who was 50% GSD, and we believe Husky or some other Northern breed in the other half, based on the shape of his head, miscolored eye, and feet. Huck was big, about 130lbs. Huck took it as his personal responsibility to rid the property of the little devils, and he did. He pursued them relentlessly, digging out their burrows, until by the end of the first summer, there was not a one to be seen. Huck was with us a few years, but sadly passed away last year. This past summer, still no more ground squirrels. I guess he left a lasting impression.
