Usually... no. Perhaps their heads could, unless the guinea pigs are REALLY skinny. A regular guinea pig is supposed to be on the VERY chubby side (like my fat lard of a guinea pig...) ANYWAY, hope...
I am no doctor but I do understand nutrition. Diets and pills do not work. You need to go back to fruits and vegetables. If you cant stand them you can get a actual juicer and juice fruits and...