My 4 year old male cat has had diarrhea every day for the last four days. He doesn’t seem to be ill-he isn’t lethargic, he played with the other cats last night, his eyes aren’t glassy…but his poop is liquid. He has not made it to the litter box two times out of four. This morning he had diarrhea and had left little spots of liquid poop around the basement. We switched him to eating small bits of wet food (he normally eats dry) yesterday and have given him lots of water. At what point do we need to go to the vet?