While having a dog would be nice, it requires a lot of Technical Work.
So what purpose would the dog serve to the narrative and the player? Would it be necessary?
It can give you feedback to things that you don't see yourself.
If the player always stays in the car, the dog would only be there when visiting friends or when home. Where can the dog help the player here, which the main character can't give feedback about?
I don't like that Mulle Meck also has a Dog. So finding an alternative would be the best.
Possible alternatives?
Also breed is important. I guess, if dog, Pug can be sort of stupid and inanimate and still be incredible charming.
Also put some kind of cloth on them to give them a slight bit of personality. Like dog with Scarf. Cat with gloves. Rat with a hat (Paperboy hat!!!)