I like the dog too! The black and white makes for interesting compositions in snow. Is this how you took the pictures or are they croopped? I'd prefer seeing more of the dog's head. In the second picture you appear to have crouched down to the level of the dog, and that's often a great start in getting a great pictures of an animal. It makes the animal, itself, more important.
You can post large images so we can see rendering of detail and shading.
Photographing white objects, like clouds, the brides dress or the fur of a dog like yours, requires care so that details of the tonality are not lost. This is where both bracketing and RAW images are useful. If the dog is particularly still, you can even use the black fur from one image exposed for the shadows with the white fur exposed for the highlights and hand merge in layers in Photshop. Even not approaching the boundries of the black and white, the effect should be impressive!
It's great to have a subject that you, yourself adore, since your own satisfaction and thrilling experience is key to the best artistry, as you are driven by devotion.
The dog had a neck and spine and paws which all add up to evocative shapes which call on you to explore. So I'd boldly go where few have gone before and just study your dog and show us your work. it will be a great journey!
I'd post an image say 500-800 pixels wide, depending on the subject and you can also post small cutouts at 100% so we can see the fine detail.
Thanks for sharing,
Asher