Does it hurt a dog to take a wormer if it does not have worms?

for what kind of worms? tape?no it does not hurt the dog..unless its heartworms...if you suspect your dog has heartworms DONOT give him the heartworm medication instead immediately schedule an appt with your vet

A Different

Of COURSE it causes harm. Wormer is poison. Wormer can hurt your dog even if he has worms, so it can certainly do damage to a dog who is healthy. A good natural wormer comes in the form of white pumpkin seeds. Dried and crushed, give your dog a tablespoon full (or so) a day for one week... it's usually more than enough to see solid results.