Has anyone had a dog with a dislocated shoulder? Please read.?

Our dog was hit by a car and has a dislocated shoulder. Once it was put back in place the vet put a bandage on the leg and around his back to keep it supported and in position. They asked for him to go back 3 days later to go back under anaesthetic to have his bandage changed. We didn't query this at first but when we picked him up the vet said he needed his bandage changed again 4 days later. I couldn't understand it because it is only a support bandage and we are really worried about the trauma going under an anaesthetic causes our dog. When we asked about it, they said it was because dogs can get pressure sores under the bandage if they aren't changed. It's not that I don't trust the vet, but it seems awful for the poor animal to be put under every 4 to 5 days for two and a half weeks just to have a bandage changed on the chance he may get a sore! What do you think? Has anyone been in this position? Has anyone had a dog in a similar situation, and if so, what did your vet do?