I’m on my second british lab. She is a hard worker in both the marsh and upland. She weighs 50lbs. My first lab was a traditional “american” style and came in at about 75 which was still ok for size and he was a great dog as well. I have seen those huge american style labs push 90+lbs. In my opinion just too big for the house (and for sleeping on the bed). I had one lab come from Wildrose Kennels and my most recent from Royalty British Kennels, mostly because the drive was much closer. Be ready to pony up some serious cash. Both vendors were reliable and I have no issues with either one. Both my british labs display very calm demeanors, my friends and guest always comment on how calm she is. However, I think it has a lot to do with how you raise the dog in the early stages, trust the crate method, don’t instill separation anxiety and you will end up with a polite mannered dog. My buddy has a 10 yr old british lab that is still psycho when people show up, it came from Southwind British Labs, let’s just say I don’t think it was the kennels fault after watching my kids grow up around my buddy. He would come over, get the kids all pumped up, jumping on him, wrestling, running around, and then leave with my wife and I to deal with the after math!! That’s ok, paybacks hopefully coming soon now that he is married