our dog Sam

Sam is getting worse from his bone cancer of the chin.it is now on both sides and i think its in his jaw now. we know that we should put him to sleep and in fact i made an appontment with his vet but the day before i backed out, i couldnt bear the thought of going threw it and doing that to him.i wish he could talk. he seams so sad most of the time. but every ones in a while hell grab his toys buy he only wants to play for a min. my husband says well we can wait untill he doesnt want to eat. well it seams like were almost there he can only eat can food and even that is hard for him and hes not drinking as much water as he use to. hes on so much pain meds that he sleeps most of the time..i guess i need imput that sleeping him is the right thing to do. im not good at this kind of stuff and i dont handle loss very well, about 7 or 8 years a go we had to sleep our other old dog she had kidney failer, it was bad she was 12 years old but sam is only 6 years old but he is a large bread and they tend to get this kinda stuff in there middle age. its just hard to say good by but i cant just think of my self.