a parasite is a bug or insect that lives of your pet/animal by drinking or using your animal as a food supply usually by dtinking blood
External parasites (such as fleas and ticks) can be treated by flea collars or products such as FrontLine Spot-on. These can be purchased from most pet shops or vets.
fleas
a tick is in the spider family, arachnid is the actual name for them
Dogs are not parasites because parasites suck the blood of other animals. Dogs are hosts to various parasites, such as ticks and fleas.