Gill don't beat yourself up about !! sometimes these things happen.
All vegas wanted to do was play, and you went out of your way to make things right.
Some so called dog owners would have just walked away.
I just hope the little Lhasa Apso's owner, will keep him on a lead, until she gets some advice, about how to deal with this poor boys problem.
and he learns that not all dogs are about to hurt him. She sounded like a lovely lady.
I hope you've got over the shock, and you chilled out last night, it must have been very scary.
Give my favourite boy Vegas a big kiss form me.