Deer imprint pretty hard when they are young. If it was raised from a fawn it would pretty much think it’s human.
That’s why it’s difficult to rehabilitate orphaned deer fawns, because if you don’t do it right they will very likely end up becoming a danger to people by expecting food from strangers and wandering urban environments, causing road hazards and potentially assaulting people who don’t feed them or try to block them from food. Many wildlife rehab centers refuse to take in orphan fawns because the success rate is so low and it takes a lot of resources to do it properly.
It’s also illegal almost everywhere to raise a wild deer fawn as a pet. They may become fairly tame but they are not domesticated and can easily become dangerous. If this deer got spooked it could easily kill that dog with one stomp of the hoof.
My top 9 games sorted by playtime, with almost 1000hrs for Valheim and about 300 for dwarf fortress.