Charm, attacked by Predator Help!

I was awakened this morning by one of my volunteers ..."Come quick Charm is hurt and its bad." She wasn't exaggerating. I cannot post the gruesome pics as Gofundmewill take them down. He is a lucky little 8 month old colt. Coyotes attacked him, broke thru the fur and flesh and left him with a gaping wound. Closer examination by the vet revealed teeth marks on the muscle. Thankfully lungs were not punctured, sounded fine....once sedated the cleaning and stitching took 6 hours.

He is now resting in a stall with mom next door.
I usually keep my 2 big dogs out in the garage sleeping at night, but it had gotten cold (for Calif.) and I was tired of the constant barking of lately.
Little did I know they were fending off predators. Back outside they go tonight.
I didnt even see how much the vet bill is. Waiting for it to be emailed. But this little rescue is going to need some help. If you can donate any amount is greatly appreciated and Little Charm ceratinly says Thank you!