I'd report an aggressive dog.
What about grumpy men being aggressive to dogs
An elderly lady who walks her lovely golden retreiver in the fields i walk my dog, told me that a man who repairs some fences (its not his land though) told her if her dog came any closer to him he would shoot it! All he did was bark, like he does at any stranger he wasnt being aggressive in anyway hes a lovely calm dog.
I dont think she reported him but I would have done, also apparently he has some dogs in the back of his landrover who throw themselves at the metal grate in the back at people who walk past whilst barking aggressively
