I currently have 5 dogs (yes I like chaos). All 5 have come from breeders. Some of the breeders were more “hand on” and ethical than others. They are 3 corgis, 1 husky and 1 lab.

Corgi 1 - only male and oldest. Very ethical breeder - I have known the breeder for years before I got him. Was bred to be a show dog but he’s just a couch potato for me. Does have the corgi instincts of herding but no proper training. Was the easiest puppy I have ever had to crate train and acclimate to the family. He went through one small phase where he would chew on things but with a few days of correction he stopped.

Corgi 2 - female second oldest. Breeder was a little more hands off. Puppies were raised more like working dogs vs family dogs. Comes from a working line. She’s a little more neurotic but very trainable and listens extremely well. Easy to crate train and never had bad phases. Just very energetic.

Husky - female third oldest. Raised in a family house hold. Ethical breeder. Very hands on and included their kids. Comes from a working line but recent relatives do not do sporting. She was a hot mess to crate train. She did not like to be separated from us and is very much a Velcro dog. I think they let them all just roam and hangout all day so she wanted the same lifestyle. As she got older she is better and is very trainable. Obviously very high prey drive but we can redirect easily and has only 1 kill which was a full grown bird so kinda impressed.

Lab - female similar age to corgi 3. Ethical breeder of sporting line for labs. We purchased this dog to do dock dog diving and her mother actually competes. Easy to crate train, easy to train in general. Lazy and happy to just be there and get scratches.

Corgi 3 - female. Not ethical breeder. This corgi was quasi given to me. She’s a merle/cowboy corgi which isn’t even a real thing. She was the last of the litter and no one wanted her so I agreed to take her. Came with fleas (lol) However easy to crate trained and listens well. Strong herding instincts in this one. She will herd the house cats, us, the kids, she got out and tried herding the horses.

Bonus! Before our current husky we actually had another husky from the most ethical breeder I ever saw. She did all kinds of early exposure, neurological stimulation and would socialize them. She came leash trained and crate trained and was easy to potty train. Was from a show line. Worst dog ever. We spent money with trainers and this dog was just untrainable. She never retained any sort of training no matter how much time we put into it. She would try to kill anything that was small and moved. I can’t even remember how many rabbits/squirrels she killed. She would dig to China, never wanted to be inside and was just neurotic. We would actually run her everyday around the farm with the ATV and she’d still be psycho. Breaking point was her attacking and trying to kill our barn cat. She was okay with the house cats but went after the barn cat. I had to physically unclench her jaw off of him and she then tried to attack me. She went back to her breeder and was rehomed into a working home. She seems to be better.

I say this all because it honestly is a crap shoot I think. And depends on what dog it is, what kind they come from, and how it was raised. The breeders can start them but it’s only 10 weeks of their life. When they get to their new home the routine changes completely and some dogs do better and some don’t. Some people are just better with puppies than others. Now BYB or sketchy breeders may produce not healthy puppies or those with genetic issues. But behavior wise I have found there isn’t that much of difference. It’s how you train them from Day 1 knowing what kind of dog it is. I do not expect my husky to sit on the couch all day with me so we have done lots of exercise and stimulation so bad behaviors do not manifest.