1. I really like this image, and the mood, my only thought is that what I assume is the dog's tail is resting on his muzzle and is slightly confusing to the eye. It also doesn't seem quite level to me.
2. This isn't a good pose for a dog; the foreshortening of the muzzle puts it out of scale to the rest of his body. Animals and people are generally best shot at eye-level; get down and shoot toward him, ideally with a 3/4 profile and him looking at you. In this pose, he appears to be laying down on a very steep slope and I keep wondering why he doesn't slide down. Good use of the sheet(?) to make an even background, but watch the wrinkles.
3. Nice idea, but at least 2/3 stop under-exposed, and as mentioned, much of his detail is lost in the background. I would suggest reshooting this one, set the dog further away from the background (to allow for a shallower DoF and a softly focused background) and the use of a fill light image right to illuminate this back.
Some nice work here, but with room for improvement. I'm not an animal photographer, but I feel that generally they're best captured out of doors, rather than in studio portraits.
The last two pictures were both taken outdoors...I still have issues with outdoor lighting, and haven't any idea how to set up lighting indoors.
The first one was taken in my living room, and looking at it as someone that has never seen my dog, I realize it could be quite confusing. She is curled in a complete ball, with her head resting on her tail. The hair in her face is actually the hair from her rump. I will try to straighten it a bit this afternoon.
I will take Aztec out again in early evening and try to play around with getting the backround better, he is within the branches of a pine tree that fell in the driveway in the recent wind storm. I might have to spread them out a bit to give some room so the branches are immediately behind him?
I love the first one - so cute!
The second one doesn't look sharp enough to capture my attention.
The third one I thought was nice but too dark so I had a go at lightening it (Hope you don't mind, it says your images are ok to edit).
Then I saw your second post, I like the second pic better, the colours look richer. (I just roughly did a shadow/highlight adjustment on Aztec to show more, he was a little lost).
I'd love to see these shots again with a play on the depth of field.
Beautiful dogs!