Another spate.
All I can say to anyone, is keep yourself and your children as far away as you can from bully breed dogs (yes, I know one was a lurcher this past week, that doesn't change the incredible danger bully breed dogs post to humans).
Don't be afraid of looking like you're overreacting, just get up and leave.
We have left parks, parties, pub beer gardens, shops and restaurants when I've noticed a bull breed dog has appeared. Mid-meal at times. Any business that allows these dogs is signing up to have customers leaving to save their lives frankly.
Don't be the moron that thinks it won't happen to you and lets your child have a playdate at someone's house with a bull breed dog, or who is afraid of attracting ire by getting up and leaving if you're in a beer garden and it'll be obvious that's why you're leaving.
Your life is literally at risk. Do what you can to protect yourself, given that we don't carry weapons capable of stopping them (and fatal damage can be done in an instant).