Best I've found are simple fleece booties with an elastic strap at top to attach the Velcro. The elastic allows you to get them as snug as you like without worrying about them being too tight. It's the same basic design used by sled dogs.
I buy mine from a woman in Anchorage who also sells them online at
Heidi & Company – Alaskan Dog Apparel and Accessories.
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Mike ~ Doting Dad to Jillie, Harper, Molly, Cooper, Eddie (RIP), Lucy (RIP), Rusty (RIP) and Jack (RIP).
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