No, not the dog next door that keeps barking but anything else that really annoys you.
I'll go first.
I am annoyed, not hate like Jeremy Clarkson would say, apparently, drivers who drive just to the left of the centre line of the road. It's particularly irksome when cars are parked on one side reducing the width to a single lane in both directions. Near misses, clipping door mirrors and mental trauma can result.
What's your pet hate?