So, yeah. Putting a sweater on the dog, probably not a great idea. Not this particular dog anyway. Maybe he did not like the color.
See, generally, handling your dog – putting a sweater on it – clipping its nails, cleaning its ears, teeth, etc., that’s got to be generally accepted by a dog, large breed or not. This dog was not well-trained and likely thought that it was a leader in that “pack.”
Apparently, the dog had been adopted, and was only with the family for a month.