no stuff, but what if it was locked and the kid forced their way into the safe? Or stole the key and unlocked it himself? Then who is responsible?
the parent is still responsible for negligence if they allowed the key to be findable enough that the child could just take it and go kurt cobaining themselves. no child would ever be capable of forcing themselves into a decent safe without the tools and time to do so, or the safe is so phenomenally stuffty that a light breeze would crack it open. again, negligence of the parent. but please, do continue building ultra-specific scenarios to get the answers you want.
Furthermore, we are talking about an animal enclosed in an outside yard that could potentially escape without the owner knowing, not about a parent who owns guns and has young children in the home. If your going to make brown townogies at least make them viable
unlike comparing a dog and a gun, a dog and a small child compare quite well -- both are unpredictable, living elements that you have to generally manage and not neglect. you don't want your child getting
into the gun case, so you make sure to keep the keys away from them, make sure the case is secure, and generally teach them to stay safe. you don't want your dog getting
out of the yard, so you make sure your fence is high enough, you get a decent leash, and you generally train your dog well. both scenarios, outside of an infiniteismal minority of super-specific cases, can easily be kept safe by being generally aware and responsible as the person who owns either.