A few questions about Parvo

Any dog, old or young can be host for the virus n never show signs or symptoms, it can be sread by anything, from anywhere. Rain will even spread it. Once u get it in ur yard its hard to get rid of. I had 3 pups, that were current on their shots get it. I brought a dog down from Mo. that evidently had it, or again couldv come from even a bird takin a poop in the yard. Anyways, the dog from up north mauled a few wk old puppy, killn it n then stsrted on anothr n killed it before i could get a clean line of sight n administered a couple doses of lead poisoning to him. Bout a wk later the last 3 pups out of a previous littet(2-3mth old) strated looking pale n sickly. Checked their gums n they were white from dehydration n skin was kinda clamy n fell slow when pulled on. Took the 3 to the vet, paid $120 for meds n a parvo test. Had to give 1 a dose lead poisoning that nite to keep from suffering. Saved the other 2 with boit 4hrs of sleep a day (24hrs) with 4 iv bags in a wk, 1qt of plain yogart, 24 eggs n 4 cans of sardines later, they made it n still doing great. Brst of luck to ya, n hope i never have to go through it.