Had a bit of a to do with these 2 ends on the River Dove a year or so back. I had to give the one on the right a slap, but the one on the left couldn't be arsed so I left him alone.
Same as any dog tbh. Depends on the owner and training.
We've looked after one this week and he's been a total nightmare. Bit my niece (adult) for telling him to get off the sofa. One of those that has been allowed to rule the roost.