My 13 month old grandson once got hold of each of our border collie x, rescue dogs ears. He gently pulled them apart, as my daughter and I both instantly called, let go X, as we walked from opposite ends of the room towards the dog and child. The little boy instantly let go, and the dog put her head back on her feet and lay quietly. It happened in a second. That little boy is now 20 and just brilliant with dogs. The border collie lived to a contented old age, and was always wonderful with children. I accept, we were very lucky. The dog came to our family when we had a 2 and 3 year old so we knew she was good with children. But, if she'd snapped, no=one could have blamed her. The children learned very quickly not to ever get in a dogs face, and we remained highly vigilant with our own dogs, and foster dogs.