Is it normal for guests to use homeowner's stuff without letting them know
My roommate's sister's boyfriend stayed over at my roommate's place for a night when my roommate was away. She has a dog and the dog typically stays at her room at night. The bowls are typically outside of the room and I always leave the doors open to allow the dog to eat and drink from the bowls. When he came over, he stayed at her room with the dog. In the morning, after he left, I found that he used a stainless steel bowl from the kitchen dish rack to fill it up with water and let the dog drink from it. I called him afterwards and he said he thought the stainless steel bowl was the dog's bowl.
I don't understand 2 thing and I hope you guys (especially from the West) can help me understand it. First, is it normal for a guest to use bowls from the rack in the homeowner's kitchen without letting the homeowner know? Second, is it normal to assume a stainless steel bowl is for animals?
Note: He couldn't find a place and my roommate offered him a place. He didn't come here to watch the home because I was at home as well.
Thanks guys