The 1st photo is the best, were these photo taken with the 50 1.8, what a fun lens i got the nikon but they are all really the same.
I like the angle in #2 but as you said the nose is in focus and not the eyes which 99% of the time should be in focus.
First photo's nice, but you really caught the pup's awkwardness in the third photo, just wish his paw was fully in frame. That's just my newbie input tho...
Gotta love Boxers, mine's my best subject (no one else will let me take random shots...)