Puppy mill dogs have more behavioral problems
“We found that across all behaviour categories, including trainability, dogs from less responsible breeders had significantly less favourable behaviour and temperament scores than puppies from responsible breeders.”
The above statement by researcher Catherine Douglas sums up the study “Do puppies from ‘puppy farms’ [puppy mills] show more temperament and behavioural problems than if acquired from other sources?” More extensive results were presented at the annual conference of the British Society of Animal Science.
via Whisker Therapy