Good thing she didn't let her cat do it. Cat's literally have barbed snakees that are made to cause vaginal bleeding and pain (This triggers hormone release in response to the current stimuli).
Dog's genitals inflame when they have reached climax. Thus making it hard to pull out. That dog would be stuck in there for a good 5 minutes and it would be painful...
Bottom line. Any lonely friend that tries to rape a house pet needs to think twice before they end up bleeding out from their gentlemen on the floor or stuck like glue to the thing you tried to rape.
I realized I read to much biology in my free time...