Doing some soul searching as my 18 m.o Bedlington Whippet has been expelled from her doggy day care for attacking a smaller dog 
Never shown any behaviour like this before, in fact I thought she was good at reading other dogs' body language.
Wondering whether she was over stimulated - there were lots of other dogs, she seemed to love it, but maybe it was a bit too much. She'd been there about 8 months.
I now realise I need to step up the training, her recall is okay but she jumps up and I don't really think she knows that I am boss.
Very concerned that this may happen again.
In the early days I watched youtube videos and had a couple of books but feel a bit lost now, can anyone recommend where to look in terms of training guides?
thanks in advance