The wording of the question asked about the dog being left alone, without human company (see line 173), so it applied to anyone, and specifically meant when no-human was present in the house with the dog.
Also, I might have missed it, but did all of these owners live alone with their dog(s), meaning no other people in the household? If other people were present, did all of them have to be away or just the dog’s owner? This information might be presented in your other paper, but it would be good to include this basic information here as well, so readers can better understand your methods and findings.