No, nothing will happen to your dog its might vomit but there is nothing wrong,
Give it heart pills (maybe and probably it is too late) orGo to a vet ASAP
YES you can.Do not let your dog lick you. Cut back on petting him/her. Do not let him/her sleep with you.
take it to a vet and get medication
Worms will make a dog skinny and unhealthy as worms absorb nutrients.