Someone hit my baby

This is my precious baby boy... he’s really helped me through the hard times while ttc and has always giving me something to cuddle with and love. He went outside a few days ago to use the potty and I yelled and yelled for him he never showed... I yelled for the past 3 days and he came back all messed up.....

Warning picture

My poor babies mouth is shattered and the vet said there is nothing they can do but send me home with some pain pills or I could put him down. What should I do this is so hard.

Edit- something I forgot to add yes he is still eating and drinking water

Update- he has an appointment Monday to go to sleep forever. ❤️ atleast my baby won’t feel pain the reason why I have chosen this is because he smells rotten like he’s already dying inside I don’t see how he could turn around from this it breaks my heart but I think it would hurt him to keep on like this

UPDATE——- I HAVE amazing news for you guys!!!!!!! ❤️❤️❤️❤️❤️❤️❤️❤️❤️ my baby ran and hid for a few days and nobody could find him we thought he left to die on his own. That made me so depressed and he came back a few hours after his appointment was supposed to be to put him to sleep. Anyways his meds are working good his mouth is healing even the bad rotten smell is gone and now my baby is here to stay with me ❤️❤️❤️❤️❤️❤️ still doesnt have much control over his 👅 but he never really did 😂 but he starting to look better