Tyson has it and is on medicine for it...anyone have any experience with this?

For those who don't know, its an intestinal parasite . Its transmitted through fecal matter and SUPER common in puppies. Either transmitted by the mother or each of the puppies fecal matter.

I was just wondering if anybody elses dog has had this and how the puppy acted. Tyson is acting fine just not eating much...which worries me.