if they are already blowing blood out their butts, its 80-100% chance its to late. i had 3 come down with parvo. 1 was blowing blood already, i went ahead and put her outa her misery and the other 2 started showing signs 3 days later. i had already started them on iv, pedialite, yogurt and sardines for iron replacement. i saved 2 outa 3. the sec litter i had, all 4 started showing signs within a day of each other of being lethargic and not eating, so i did what worked with the first 2 and kept them alive for 5 days and then they started dying off 1 by 1 and in 2 days all had died, i even upped the amount of fluids and yogurt bc they were younger.i dont really think i would want to see a grown man running around in tights, no metter if they are under armor cold weather.
. needless to say, i sprayed the whole yard down and tilled it up and sprayed it again and didnt have anymore issues, even after i moved. i do the same with my iv bags, i tote them around 99% of the time too and keep them in the tck or boat incase the dogs or myself need an iv, especialy in the summer months. do what you can to save them, but its 99% an uphill battle with limited chances of living. choose a couple and put more efforts in them than the others, but try them all. good luck. ur in for a long haul