Thanks, all. I just can't turn a blind eye to an animal, even though I know I can't save 'em all.
Vet report:
Heartworm - NEGATIVE. This is a big one. Treatment for HW can be very, very expensive. We've been down this path with two other fosters, one of which almost died from the treatment. He recovered and last we heard, is doing very well. We adopted Fred, the other dog treated for HW, and he had an easier time of it than Jack did.
Intestinal parasites - NEGATIVE.
Microchip - None present
'Nad report - he's still got his balls. Removing them costs $329 which is beyond our budget. Working a different angle and we might be able to get it done cheaper. This isn't a must-do right now anyway.
Approximate age - 16 months, per the vet. Weight ideal at 47.2 lbs.
Vaccinations - Rabies, Parvo, Lepto, Bortadella. Not given - Lyme disease and canine influenza.
This boy has been fed well but for some inexplicable reason, was dumped. Speaking of dump, he took a dump in the house yesterday but after keeping a much closer eye on him, his record has improved to 100% - he pees and poops outdoors.
HW, flea and tick preventative is UNGODLY expensive. We'll cover him for a couple months, but then whoever adopts him will need to shoulder it from that point on.
BTW, he's really big into frisbees and will even bring it back to you!