Do not over feeding your dog, it is not good for them... get consult by your vet... that thr right thing to do...
If this is new behavior for her compared to other winters, you may want to check with your vet. My dogs have always eaten more earlier in the winter season to build up their fat level (helps them stay warm), but they level out eventually.
I have 2 big dogs and 1 small dog but my 2 big ones allways eat more in the winter but also like spending more time out side it is weird how they`s sort of thing happen. Is she garding her food or hiding it away because if she is she might be showing sign`s of dominouns but if she is just eating it then it could be that her fat for the winter is just prepering for colder winter to keep her self warm .
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