Treat Harlow’s Parvovirus

as some of you know i just rescued a puppy, harlow. today he was acting a little sluggish, threw up once and was refusing to eat. i took him to the vet and they have informed me he has parvovirus the place i took him to quoted me $3865+.
even though i’ve only had harlow for a short amount of time my heart is broken i’ve become very attached to him, he is my first child. thank you.