Please help us our baby Zelus’ vet bills

Okay, so my boyfriend and I are huge animal people. We're going into our senior year and we decided we wanted a puppy. We went to multiple animal shelters hoping to adopt one in need of a home when we came across puppies that were getting released that day. Its like he was made for us. He was a German Shepherd/Rottweiler mix and he was absolutely perfect. Zelus was our ride or die. He went everywhere with us for as long as we had him. He never left our side 24 hours a day 7 days a week for a month and a half. So im sure you could imagine that when he got run over by a truck, we were devastated. Zelus seemed fine though. Just some pain in the lower half of his body. Something healable we thought. We took Zelus to multiple places, and apparently he took a turn for the worst. They couldnt save our baby. Zelus had a cracked pelvis and his bladder had been completely detatched to where he could not expel urine with no thriving tissue to sew it back together. We had to put him down. Easily one of the worst days of my life. My grandma had to pay the vet just so we could leave the place and go bury our baby. Now we have a ton of vet bills and not our little man. We would appreciate anything we could get from you guys. Thanks so much for your help.