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Jane, the only worms you can see with the naked eye are the roundworm and tapeworm. The roundworm is cylindrical and may coil up in the feces. The tapeworm is flat and segments of it look like little boxcars which when dry look like little pieces of rice. Over the counter products containing either pyrantel or fenbendazole address roundworms. Over the counter products containing praziquantel address tapeworms. Please note that flies will lay eggs in feces. Those eggs will hatch into larvae (maggots) which are often thought to be from a dog. Please respond with further questions or concerns if you wish.
Please note that worms in his food would be digested by Mister and so wouldn't appear in his feces. I don't see the need to starve him. Presumptive worming with the products I mentioned should be considered. Please continue our conversation if you wish.
I've offered up all I have and so I'll opt out which will give another expert the opportunity to enter this conversation...perhaps with other ideas for you.