We had a similar thing happen this weekend we went to visit family who were camping with their dogs. Met on beach keta in lead theirs running free and he ran up to keta so she responded by bouncing at him and he barked and growled so we kept walking. They settled an were running together. We then go back to their camp site and walk up to tent and the two dogs are barking at us my cousin says it's ok come in and the one goes for keta and bites her ear she slink back behind my husband's leg and hid. They put theirs in the car we stayed a bit and left. She has not been the same since very quiet and doesn't want to now . Not like her at all . Hoping to take her over my mother to play with her best friend in a day or two to get over it. Keep walking and socialising as they do enjoy it ,it's just the odd few dogs who don't like them but you find that with people not everyone likes everyone don't give up.