Not sure what I can do about this but my usually friendly dog, who looooved to run around in the park with other dogs is no longer interested in any kind of dog company.
Yesterday I took her to the park and made her best to stay away from other dogs, started jumping as she does when asking to be picked up, and At some point he hid behind my legs and when a dog got a bit nearer she tried to bite him.
She was nothing like that before the kennel stay. The kennel staff told me that she had found the other dogs too much which I thought it was ridiculous so I didn't question them more. It is a few weeks since the kennel stay so I don't see the point to ring them and ask what happened. In any case, I rang them last week before noticing this, to book her again and they told me they were full even when the booking was months away and not in peak season 
The question now is, how do I get a hyperactive now nervous dog to trust dogs again? She seems quick to learn and very slow to forget...