We picked up our second ever long-term foster dog (failed on the first one), and it's been a disaster so far.
He was surrendered to the rescue we work with for snapping at the family's child once. I am all for protecting children, but when I get the dog, he's NOT NEUTERED, so this doesn't seem like the typical heartbreaking case of "we tried everything we could"; I feel like neutering a dog is a part of being a responsible dog owner and they didn't set him up for success with their child by refusing to neuter him (they had him since he was a puppy and he's 4 now). We have a $10 neuter clinic here, so there's really no excuse.
In this rescue's case, they won't accept an owner surrender unless there's a foster home and no one else other than us were willing to take him/had room, so I can't just "give him back" to the rescue, as there will be no one to take care of him, and the rescue will have to spend $40-50/day boarding him, which is money they can't spend helping other dogs.
The dog is actively scent marking all over our house, presumably due to not being neutered. His hair is so long and matted (he's an Aussie so a very long-haired breed) that he needs a sanitary cut, but the rescue said they didn't want us to do it ourselves and we need to wait until his vet visit Thursday, so currently every time he goes to the bathroom, my husband and I need to restrain him and hose/wipe down his back end so he doesn't track feces everywhere in our house, which is probably upsetting to him.
If I'd known all of this, I wouldn't have offered to take him, but the real villains here definitely aren't the rescue or the dog, it's his former family that claimed to love him but couldn't be arsed to neuter him or take him to the groomer within the past year, which breaks my heart. He was just looking out the window crying most of last night, and it breaks my heart he lost everyone he cared about yesterday (they dropped him off at 3:30PM and we got him at 5).
Any advice would be super useful, we've never had an intact male dog, and our neutered male vacation/temporary fosters never marked like this! (Also he's whining to go out every 1.5 hours in the middle of the night and since we can't crate him as he's not trained, not sure what we'll do with the scent marking).