We had a visitor last night in our backyard, a cat that wanders the neighborhood. It has a collar and tag, but won't let me get close enough to read it. Last night he/she was sitting patiently at my back door like it wanted to come in, and Penny was beside herself, hissing and growling the whole 9 yards. Her tail was puffed up fatter than I've ever seen it. She was NOT amused by this potential intruder and looked like she was ready to pounce!