My baby Panther used to have the runs all the time until I switched his food. It could very well be something in the Friskies that is upsetting your cat's digestive system. Have you looked into switchng foods on a more permanent basis?

Also, I have used in the past Eagle Pack Holistic Transition which is a dry powder that is sprinkled onto the cat food which helps with the runs and other digestive troubles.

I hope your baby feels better.