It’s coming along really amazing! Great job so far! With all the fantastic work poring out, I just may have to get a late start myself! Very inspiring!
I think the muscle definition is looking a little strange on the back legs for a couple of reason, that you might try to work out better. First off, the crease to show the definition between the thigh muscles is to deep, and the front muscle definately needs to have more mass, as well as be broken up. Maybe you could find some dog muscle refrence to see how exactly it works, even if not though, if you think about a bodybuilders thighs, there are two main masses of muscle that are very evident. Secondly, I think the second joint in the back leg needs a bit of calf muscle to it. Of course legs like this don’t work quite like a human calf, but there still is a bit of a ball back there, directly under the bend. I think anyway? Also, maybe if you try scaling the thickness of the legs between the 2nd and 3rd joint up a little, it will give a better sense of power to the legs? I don’t know, just a couple of things to try anyway? Looking great though, can’t wait to see you define it more!