I have a bad feeling

3 days ago Rocco took a real turn for the worse. He can't walk at all now. We have to help him by wrapping a towel around his belly and help support him. Yesterday he started peeing on himself because he couldn't get up. I told my husband this may be the end. I mean how far do you take it? He's bright and alert and seems happy enough, but he's a 75 lb dog. Moving him around is not easy. I don't know what to do. Tomorrow we have an acupuncture appointment for the dogs, I'll talk to the vet then and see if there's anything else we can do. I'm giving him such massive amounts of steroids now and it's not helping. Maybe there is some other medication we can try. I'm scared and I'm worried and I do not want to have to face the decision I think is right ahead of us. God, this is so hard.