In order to make yourself feel better, take him to the vet for a FULL physical and blood work and explain to the vet your worries. It might be the weather, but maybe not. Mine can go forever in hot or cold weather.
Misty- Samoyed Mix
Tannor- Golden Retriever CGC
Robyn- German Shepherd CGC
"A dog is the only thing on this earth that loves you
more than he loves himself."