He absolutely could have pulled a muscle or a tendon. The fact that he isn't acting like himself makes me think you might be best to run him over to the vet just to make sure, I am sure there would be some anti inflammatory's that the vet could perscribe that would make him feel better. The not eating is what worries me the most, that usually means the dog is in pain or really feeling unwell. If that continues for more than a day or two, definitely take him in just to be sure!
Hope he feels better soon, poor thing! Winter is just not fun!
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