Mrs took dogs for a walk earlier today everything was fine until a collie came over to my dogs they were fine to start with but then my lurcher basicly attacked the other dog for seemingly no reason, ah lass says it seemed like ages but was only a few seconds... what could have caused my dog to do this as she hasn't bothered with other dogs and has never been aggressive... how should I deal with this so it doesn't happen again or could it be a one off... I wasn't there so don't know all the specifics what happened and ah lass was too busy crying lol