Poor boy. Definitely see the vet ASAP and have a fecal done. If you can, save any worms you find. Your vet will determine what course of action is required.
Heartworm preventatives, which also cover other types of worms, are relatively inexpensive. $32 - $40 for a 6 month supply. Frontline is the pricey one. I don't remember exactly how much.
Ringworm is highly contagious. Not sure if that comes out in poop though. I'm also not sure how contagious the other types are. You could call your vet's office today and talk to them.
Keep us updated.
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