My first aid kit also gets used on my pets (far more than on humans) and once on someone else's dog which had been in a MVA. Worst injury was a metal fence post entering hind leg just above the "knee" and exiting at the hip on a working dog. Fortunately my partner was a vet nurse. Problem being I cant just phone for an ambulance for a dog the way I would for my son so I have to be able to treat much more serious wounds than I would like and stabilise wounds for far longer. Having had to use most of my clothing as dressings and run for 4 miles carrying a large mut with improvised dressings I carry a FAK adjusted for pets. Something to think about if you have pets. So pissing off ER may not always be a problem.