Biting feet - need boots?

We were really cold in Minnesota today. The current wind chill is -5 at 7PM. I noticed a few times that after being outside for 5-10 minutes, during each play time, Dagny was biting at her feet. She would run through the snow, roll around, then collapse and bite her feet. Is she just playing or are her feet freezing? Regardless, I brought her in right away because I was worried of the latter. I understand that there are winter boots or covers for dogs. Has anyone ever used these before? I'm hoping to get tips for purchasing. What was your experience? Thanks! Theresa

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