It's difficult to find them. You're almost better off making your own. If you sew at all, here are a couple things to try:
 
* Buy some cheap fleece gloves at the second hand store. Cut off the fingers and stitch some velcro around the top. A YTer taught me that, and it works great. She didn't even bother stitching the Velcro, just wrapped some around the top. 
Or, 
* Buy some fleece fabric and make some tiny ones. All they need is a simple sack. That's exactly what sled dogs use. You just want something to keep their paws off the surface of the snow. 
The only problem with fleece is it gets wet if the snow is melting or wet. For that reason, I'm going to order some waterproof fabric from 
Dog Booties and get a friend to make them for me. The Web site doesn't make booties small enough for mine. 
    
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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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