Yesterday OH had to take the 3 dogs out on his own as I had a horrid migraine. Where we walk them is a field with a river along one side where the bank is very overgrown. All of a sudden a man appeared out of the overgrowth (why he was in there we have no idea) but Rizzle (8 month old Lurcher x border terrier x lots) started snarling and growling then took off and grabbed the mans trouser cuffs (still snarling). The man apparently didn’t bat an eye lid, kept walking, didn’t even try to kick her (which to be honest was surprising considering her bad behaviour) but also didn’t stop walking so OH could grab hold of her. She finally did let go and go back to OH. The only thing OH did say was the the man did stink of alcohol. Any ideas as to why she would suddenly show this aggressive behaviour from a distance? We know she has a very good nose for scents (it’s one of our training games) and she can recognise one of our neighbours at a huge distance on the fields and does her silly squeaky welcome to him until he arrives. But I am concerned about the aggression so ideas welcome please.