PLEASE HELP FELIX our fur baby hit by car leg amputee

UPDATE on Felix, I have added new photos. Felix had a sore. We didn't know about until 4 days later. I Remember there was a bit of clue stuck to his skin and fur. We thought it was from the surgery while the monitoring his vitals during surgery. We couldn't wash it off, was only a little. Felix got thick fur and I thought it will come off by itself. Oh how I want to kick myself, I knew Felix had an follow up with vets and we would have asked to look at it if not coming off. 4 Days after stitches came off we noticed he licking one spot alot and thought it was still pain. He was still on pain meds but had to see vet to reduce the pills. I was shocked to see that Felix managed to pull the fur where the clue was and made a sore. In a couple of days he has licked the sore to a big sore. We rushed back to the vets. He is back on stronger pain meds and cream to treat him. We have to air dry the sore and at night cover with the cream. My poor baby have the cone back on and vest at night. He is really not in good place. However the Other vet said he wasn't on enough pain relief and used the sore as it comfort him. We knew he was and had this question a few times at the vets and they recond he was on enough pain meds. We know now he wasn't coping. Since Felix is on strong meds he is more calmer and more snuggled. After a week we will see if he needs to have less pain meds. It's day 3 and the wound is looking dry but needs lots of healing. I do feel bad for not keeping an eye on it sooner and mention the glue when we had him at the vets when stitches was taken out. Thank you to all that have been supported us we appreciate it very much.