Sorry, I'm not very good at critques. Only my second one
Okay, the lineart to my eyes is amazing. I love the colors and markings. I also like the accessories on it. I like the santa hat on it. The chest fur is very good. The style you did the eyes is awesome. This is a very good piece of artwork. I don't see anything bad about it at all in my eyes. I love how fluffy it is. I think you can draw the shoulders very well. You said that they're messed up but they're not.
Again this is a very good drawing. I think its amazing.
I tend to be harsh on these kind of things, so don't think of it the wrong way.
Ok, the first thing I saw about this was the muzzle, its unnecessarily long and the lower jowl does not seem to match up with the main part of the muzzle. It's better to trim it down and give more definition on height and length. The paws somewhat bother me as well, and so do the legs. The leg that is bending does not seem to have a joint, it just wrap around the chest and continues on the bone. It is also a strange angle you put the leg in, and when people over lap the arms on any sort of way, it either at the 'wrist' of the canine,like a cross, or the paws just lightly overlap without the other joints interacting. The paws need more definition on their part, and they need to be flat, then point up more towards the end. The neck is over stretched, and the shoulder seem farther back then it should be. A little fact is that dogs don't have a chest, its just a imitation for the fur and extra skin. So it is better to place the shoulders first and give the skin and fur its part.This also caught my eye, the back legs seem to be forced back, due to the sticking out, and I knew that you were trying to make them stand straight, but they look distorted and painstaking. Just roll them forward and that is about it.
Sorry if I rambled on or hurt your feelings, it just I want to help you, and that is all
Oh, do you remember when we were talking about Aaron Carter? And how much you dislike him? xD I'm seeing him on Broadway in a couple of days! (Not like I'm seeing the show just because he's in it; he just happens to be in it.)