parasite/host
Parasitic.
A parasitic one. The host is harmed, the invader benefits.
yes
A tapeworm in a dog is called the same thing, a tapeworm. The most common kind of tapeworm found in dogs is the Dipylidium Caninum, which is the cucumber tapeworm or double-pore tapeworm.
A dog tapeworm will eat whatever the dog eats! It will digest the food that the dog has eaten, which is why affected dogs might be thin, as the tapeworm is taking a lot of nutrients from the food.
Tapeworm segments can come out as the dog sleeps, yes. It's not the whole tapeworm, and the majority of the worm will still be inside the dog. Take him/her to the vet to get the condition treated.
one organism gets something useful, and the other doesnt
yes, the cow eats the tapeworm, that is why the tapeworm is in the cow's intestine
no
parasitic relationship
When you eat the tape worm gets bigger and bigger and will not stop growing until it you get surgury for the dog.