Hi tommygirl,
What disgusts me about the whole ordeal is you noticed instantly the marks on your dogs that were obviously overlooked by staff who supposed to see your pup everyday to feed, walk and toilet her and they noticed nothing? It's not hard to see scratches and scabs on a dog's face especially when they need feeding!
If you don't receive a reply within 7 days from that email...write a formal letter requesting a result of the investigation you were informed at getting from the manager in writing giving 14 days notice...regardless that your pup may have self inflicted herself or not, the fact the staff state they didn't notice is rather appalling to say the least...was there a time she wasn't attended to then for a day? B/c if staff didn't notice then they didn't feed her maybe...!
Just my opinion, if it were me I would handle it all in writing...and not take my dogs back there!