Today at work I called my fiance, and he said Rocky's had diareahh

It was like 5ish, I wouldn't get home until almost 8, but he already had rice cooking and chicken breast defrosting for Rocky! He was taking care of him, and put Bella in the play pen to be with Rocky and he said she just went up to him and laid down by him. He finally ate some rice and chicken, now he's taking a little nap. I took his temp and it was 101.6, but I'm still going to check it again before I go to sleep. Rocky had a vaccine on friday, I don't know if it's that because he was fine friday and saturday. Today he's just not himself, his ears are down, he's wasn't as jumpy when I got home..he just wants to lay in his bed in the playpen. Please keep him in your prayers that he's going to be O.K. If he's still like this tomarrow I'm going to take him to the vet.