Greetings, its been almost a month now when my cat poop the first part is solid but it always end with diarreah , yellow soft stool , i thought this might clear up on its own since he is acting normal and playing , doesnt look like he is ill , is this something i need to have him checked for ? , want to add that he is currently having 2 types of dry food served at same time cause he alternate between them , one is royal canin kitten and the other is hills pet kitten dry . thanks!