ALWAYS, ALWAYS ask before greeting a dog you meet at the brewery, or anywhere in public! Teach your kids to do the same! And, teach your dogs to wait patiently by your side while you say hello to others.
Not all dogs are at the brewery to socialize. Some of them might be working service dogs. Some of the dogs might be practicing their distraction manners, meaning that their owners might not want them to say hello to every person walking by. Some of them might be the friendliest dogs off leash but get frustrated by on-leash greetings.
It's always a good idea to check BEFORE you start the interaction with the dog so that everyone can be safe and successful!