my dog ate twice as much heart worm medicine than prescribed for his weight, he’s 17lbs and the meds said 26-50, so he usually gets half that but he got whole, what do i do, will he die?!?!

I want to know how much money would it cost to go to the vet and prescribe the medicine to de-worm your puppy

are dog worms dangerous?
my friend say they get in your skin and become itchy.
si if my dog has the and they are dangerous how much will the shot take?
and will we keep having to go to get more worm shots?

PLEASE HELP!!
i meant if i get in contact with them.
and can it become a disease to me or will i get sick?
my friend said that is i dont get my dog shots then ill get them if i pet her too much. and she said it gets inside our body and we start to itch.
IS THIS TRUE?