What about when that one dies. from markrath. others r gone meekos dead cant find any strays any where
True, but I don't want my dog going in to town to sell my things for me. He doesn't speak [insert your native language here] nor does a dog have the opposable thumbs that are necessary for engaging in tool making, trading or the like.
Dog vendors? Got em. Vigilance or whatever that pup's name is, does respawn if he is killed, same as the horses.
Dogs all ready have limitted combat, that's good enough. You want a combat follower? Hire Mercurio or snag up some Lydia.
Dogs do alert you to danger as of now. Is it exactly what you're looking for? Probably not... But they do it all ready.
On another note, there is a random occurence with a stray dog that allows you to gain it as a follower. Infinite stray dogs with a small chance of the occurence happening.