Each size has their own page and their own respective link.
Blizzard Buddies Dog Pajamas - Available in XX-Small, X-Small, Small, Small/Medium, and Medium. Ranging from $10 - $17. Free shipping.
Snowman Dog Sweater - Available in X-Small, Small, Medium, Large, X-Large, and XX-Large. Free Shipping. I really like the quality on these sweaters and these are selling fast.
Not quite holiday but cute. Panda dog sweater - Available in X-Small, Small, Medium, Large, X-Large, and XX-Large. Free Shipping. These are the same as the snowman so nice quality and they are also selling fast.
Present Holiday Dog Tee - Available in Red Sizes XX-Small, X-Small, Small/Medium, Medium, Large, and X-Large. Or Green Sizes XX-Small or X-Small. Starting at $4.