To let others know what happened to my dog?

[DaycareNamechange]

Sorry if this is long.

My dog has been going to daycare for about 9 months. It's a big place -several fields for them to run about in. He goes once or twice a week. Incidentally, my dog is not aggressive. He is soft as mush, and staff are constantly remarking on how sweet-natured he is and how lovely and respectful he is with the other dogs.

About 5 months ago, I went to pick up my dog from daycare. As he was being brought out, I heard one dog barking aggressively and another yelping. The member of staff then emerged with my dog. I asked her if something has just happened with the dogs and she said no. That night my dog was extremely distressed and crying. Turns out he had been attacked as he came out. We found wounds on his ear and he required treatment. When we got in touch with the owner, he spoke to staff to find out what had happened, apologised, banned the dog who has done it, forked out for the vet fees and assured me that this kind of thing was very very rare. For those reasons, I allowed my dog to go back.

Now to last week. A week last Sunday I noticed my dog's side had swelled up very badly. Took him to the vet Monday morning. She shaved him and found bite marks which had obviously become infected. He has had several trips to the vet now, has had the wound drained, has undergone general anaesthetic to have a Penrose drain inserted to let the fluid out, has stitches and is on more antibiotics. All this has cost £600 so far (hopefully insurance will pay out), the postponing of our holiday, and distress and pain for our dog.

These bites did not happen under our watch. I am positive of this. I wish they had as my dog loves daycare and he won't be able to go back now. I haven't got in contact with them as I've been too angry and been trying to think what to say.
WIBU to post what has happened on their Facebook site which is read by other users of the service rather than getting in touch privately? I believe other owners ought to know what kind of place they are leaving their dogs in. I've no intention of sending my dog back there after two incidents in under five months but I do feel other owners should know that staff either aren't informing of fights or that they are understaffed and aren't even noticing. I'm really not sure what to do and wonder if I'm being clouded by emotion.

Thanks if you've read this far.

[Veterinari]

Yes it would be a LA license so this is probably the best route.