We have this Wolf Hybrid (W) at work (Doggy Daycare) who stays in our front playroom with her sister (B - Australian Cattle Dog). Recently we've installed a metal gate barrier due to B being reactive to dog(s) on the other side of the window, but she bounced on it so hard that she knocked it loose and got one of her toe nails ripped off.

What is the best way to inform pet parents and pedestrians not to allow their dogs to approach the window where B and W are due to the possibility of them causing self harm to themselves or each other? W is actually pretty mellow until B sees a dog(s) and then W reacts with her, So each time that happens we have to put B in a private room until things slow down.