Animals can be unpredictable just like people. My dog, before it past away, was well trained and friendly toward everyone. All my neighbors loved him and wished they could have a dog just like him. One day out of the blue, he got very aggressive, without provocation, toward not a stranger but my own father. My dad let him know who was boss and sent him off whimpering and peeing on himself. Moral of the story is always error in the favor of caution/safety when it comes to dogs or any animal.
P.S. I love dogs, had them all my life, and plan to have many large and small dogs in the future.