I like the warm processing and saturation, although there are one or two faults...
the first has too much flare, it kinda looks arty but I just don't think it works.
the nose in the second pic is out of focus while the snout and head is. More DOF needed, if you'd have closed down a stop and focussed on the nose or halfway up the snout you'd still have got the eyes in focus as well as the nose and wouldn't have sacrificed much background blur.
I like third because the focus is almost perfect and the expression on dog's face is nice. I'm guessing you were attracting his/her attention to the ground by ruffling the leaves or something.