Maybe IABU. My dog only ever barks at cats, that's it. Never at other dogs or people.
So, new neighbours at the back recently moved in and have cats, they have them on leads and put them up against our fence.
When I let our dog out and he sees the cats through the fence he'll bark at them. I will then bring him in.
Neighbour saw me today and challenged me over the barking. He said it was annoying. I just said there wasn't much I could do, he's a dog and he barks at cats and I bring him in as soon as I hear him.
Neighbour then responds with, "but my cat doesn't make any noise". I just looked at him, and said, but he's a cat. He doesn't bark.
Neighbour then threatened to call the police if this carries on.
Am I really being unreasonable? I don't know what else I can do?