Help save my Chihuahua please

Hello my Arlin Gomez. On the 26th of January, my Chihuahua Penikiki was attacked  by a stray Pitbull. The dog let loose on Penikiki and bit him, groppled him, and tossed him like he was a chew toy. The owner of the dog can rushing forward and restrained him as I took my chihuahua and ran. As luck would have it, there was a animal shelter nearby where I rushed him to, and from there, he is being treat at the Vet Hospital. The vet told us that he would need a CT Scan, x-rays, and possibly surgery. The bill comes down to around $4000.00. My family and I cannot afford to pay the bill on our own. Penikiki is loved by our whole family. Please help us pay his bill. We Would greatly appreciate it. Bless you all