I'm going to apoligize in advance if I accidently sound harsh (I'm not trying to, I promise ^^)
First, I'm going to say what I always say. Learn from real life, google wolves or dogs or canines and find real photo references. Mess with your dog (if you have one) to test how legs bend (be gentle of course). Diagrams of bone and muscle structure help as well.
Here's one that might help:
http://upload.wikimedia.org/wikipedia/c ... n_view.jpgSo what you need to improve on:
Head: The head on your dogs look kinda boxy, mainly around the chin area while the forehead needs a bit more box on it at the brow. On some of your drawings it seems like it's showing the dog's profile, but you tried to draw the mouth more like it's facing toward the viewer. The mouth also seems to start from a very low angle and come up too high... it's kinda hard to explain, but it should look more even on each side (if that helps explain it).
Legs: Your drawings legs hardly have any form to them. Dogs have hocks (look at the diagram, it's the bone that sticks out on the hind legs) as well as elbows where their front legs begin to connect to the rest of the body. Also, for the paws, not all the toes are on one side. At some angles you may need to draw only one toe line and two if the dog is at an angle. For the hindlegs, where they connect doesn't curve in toward the rump (look at the diagram please) it should smoothly curve up then out toward the tummy area. I usually just end the line once it starts to curve out, but other people don't (it's your call).
Body: Observe in the model how the dog's figure has a dip toward it's tummy. This can change depending on if your character is overweight or not, but I just want to point out that most fit dogs have that where their ribs become smaller. Your dogs also need shoulders, they would be right above where the front legs connect to the body, basicly a lump at the junction of body and neck.
Tail: Some of your tails connect at an angle that the spine shouldn't be able to bend in. If you want their tails in the air they should go out and curve slowly up. Remember that the tail is a continuation of the spine. If you can, then imagine how the spine bends and then imagine how it would have to bend in some of your drawings, painful right? Imagine the spin beind whenever you draw a tail, it should help.
If you don't understand something then please look at the diagram, it should help explain what I'm saying. Keep working and you'll improve ^^
I hope that helped.
