Maybe has something stuck in his throat. Did he eat anything unusual today. Pups can find all sorts of things to chew on. See if u can reach down his throat and feel anything. If u can but cant grab it out id take hm to the vet. Hope he feels better.
I thought that too so I tried sticking my fingers down his thoat to make him thro up an nothing came out... He's always thirsty so I'm thinking his throat is just dry but he has access to water 24 hours a day so idk. Hes eaten a lot of foo today though then normal... Maybe thats it. I was just at the vet yesterday. He's been with me all day cause we went to a puppy class.