i can understand males trying to be top dog etc after all they are all entire.
but it seems strange to me how you can have 10 in a class all around the same age and only 1 has problems with the others.
some dogs in the leo world your dog only has to make eye contact and they grumble, others on walking past them at a wide berth and they have ago.
like archer said we have had the situtation with tob being had a go at then him grumbling at others because he is on guard which is not him.
i still think if dogs grumble at another dog they are not good examples of the breed temperment wise they are not very stable.
i know a few and i wouldn't have a pup from them because i don't like the nature of the sire even if they do well in the ring.