Our dog has been left alone for about 8 hours before & he's fine.. Just sleeps mostly. Now I'm starting up a pet care business, I'm at home a lot & he just sleeps most of the time in between plays, feeds & walks. He's one lazy dog! Lol.
I do worry about her leaving the dog in her car or even at home while she's at work while he's still a puppy though. Toilet training can be hard enough.. Imagine being crated for 8 hours & nowhere to wee. I don't really like the idea of crating dogs in the first place, it just seems unnatural
But it's not fair to leave them there for 8 hours just so they don't mess on your carpet or in your car. I've no idea how she's going to get around that.. Or if she's even thought about it!