Cute pups! A lab puppy.... sigh. On #2 - I don't think the bricks themselves are too distracting, but the fact they they are only in half the shot makes them so. If they were the entire background, it'd probably be a cute background (keeping the puppy in a pot pose!). On the last - the head being cut off doesn't bother me at all. I agree that either a little more or less focus on the eyes would help.
On the first -- I have a black dog too so I know how tough they are to photograph! I've found the easiest place for me to get an decent shot is my front porch -- all the sunlight without the harsh sun or strong shadows. Anyway, I think a little post processing helps the first shot - I took the liberty (I hope you don't mind)...
