15 week old kitten very bad diarrhea

i got a kitten at 11weeks old its about 15-16 or so weeks old now and is having very bad diarrhea  the previous owner fed it purina but i could not find any of the purina at the store i went to so i bought wiskas witch is what all my previous cats have had. he was good for about 2 weeks but for the past week or so he has just had terrible diarrhea so bad that when he gets out of his letter i have to clean his paws off  aside from the diarrhea he seem perfectly healthy full of energy eats regularly and the whole bit any idea what i could do to help him?

Firstly see if you can get the Purina on the Internet, or ring the person you got the kitten from and see if you can work something out there.

Secondly visit the vet.  The kitten may well have worms, or some other intestinal parasite.

BTW How soon after arriving did the runs start?  If immediately then I suspect the kitten had them before you got her.

The food CAN do it, but that's not the only possibility.  A better quality food might help, but just like humans, kittens can be sensitive to various ingredients, most notably grains.

But I would have the vet check very carefully for other problems, such as parasites, coccidia, giardia, etc.  Those are all treatable, but they can cause a kitten to crash very suddenly.

A switch to a soft food might help, in the short run, too.

I agree, it could be the food or a tummy bug. I have found with my own cats, that by taking away their cat food and giving them boiled chicken and some rice cooked in the water that the chicken was cooked in helps to clear up any runny poop in a day or two. I keep them on this for 4 or 5 days just to make sure and then gradually introduce the cat food again. Hope this helps and goodluck. If it does persist a visit to the vet is a good idea.

I  had him for 3 weeks before it started

I  had him for 3 weeks before it started