The best place to check to see if your dog is too warm and may have a fever is the inside of the ear. Gently press the palm of your hand against the inside of the ear. It's very hard for us to determine fever by touch alone because a dog's normal body temperature is warmer than ours, I believe around 39°C. So at anytime you would check your dog for fever, he will always feel hot to the touch.
Only a thermometer can give an accurate reading and I'll leave that job up to the vet!!! LOL
Keeper of 5 snakes, leopard geckos, 1 green iguana, 20+ tarantulas, 2 dogs & a bunch of rats!