Dogs do not have problems expressing affection in public.
Dogs miss you when you're gone.
Dogs feel guilty when they've done something wrong.
Dogs admit when they're jealous.
Dogs are very direct about wanting to go out.
Dogs do not play games with you -- except fetch (and they never laugh at how you throw.) [Hey ladies, we men just laugh lovingly at how adorable you look when you throw... as long as it's not a shoe.]
You can train a dog.
Dogs are easy to buy for.
The worst social disease you can get from dogs is fleas. (OK, the really worst disease you can get from them is rabies, but there's a vaccine for it and you can kill the one that gives it to you).
Dogs understand what "no" means.
Dogs mean it when they kiss you.