Have a tissue or two handy! Luckily Billy found a happy ending, sadly many puppy mill dogs aren’t as lucky. Please, if you are getting a puppy or kitten, consider rescuing from a rescue or shelter, or find a very reputable breeder. Sadly too many dogs sold in pet stores come from puppy mills like this one.
Gratefully more and more people are becoming aware of puppy mills, hopefully someday, they will be a thing of the past.