I have an American Staffordshire Terrier who also keeps the squirrels at bay. She catches about one a year, that's enough to scare them off the rest of the time. Alas, she also loves to eat green tomatoes, so I have my garden beside and in front of the house, while the dogs stay in back.
Be careful what you wish for. My dogs would be harder on my garden than the squirrels (it's my own fault--I was playing fetch with the pit bull with a green tomato, and she happily ate it after our game.)
Here she is, "smiling" at the tomato. Seriously--she smiles at us.
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