I have a 3 year old cross terrier, who has suddenly started to run up and bark at strangers when out walking. This is unpredicatable and does not occur all of the time.
It seems however to be prompted by people running up fast, today however he barked for no reason at a couple just walking past. He also is becoming agitated with other dogs, this has become worse since he was attacked by a much larger dog which lives in the area. Can anyone help with some advice?