A growl is a warning. Plain and simple. Do not under any circumstances allow your kids around that dog. Especially since some dimwit is encouraging people to pet the growling dog until she calms down. THAT is a horrible idea. It comes down to protecting your kids or ticking off clueless family members, protect your kids. Especially since you have a young one that is at the age where all dogs are just as great and loving as their own. It doesn't work that way and we know that but they don't.
Protect your kids and whatever you do, don't bring Ammo into the mix. That could create further problems. The growling dog could be a huge threat in Ammo's eyes and could result in massive vet bills. Nobody wants that.
Even if it means no longer attending family functions unless you can be certain the growling spoiled brat isn't there... OR start having the functions at your house and restrict your SIL from bringing the growler. They'll either see your dog behaves or they wont, doesn't really matter. You know your kids are safe with your dog.
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