Doggy mills/puppy farms are very cruel places I learned when I rescued mine from the shelter. They are often just left in kennels all day, not cleaned out till it’s so soiled it’s falling out, the dogs don’t have much of a gentle touch so they are skittish and scared to be pet.

Mine took me a month just to get me to comfortably pet him. He still hasn’t come up to lay next to me but he’s made a lot of improvement and having a big dog who can show him the ropes has really helped him.