Let's be honest. Everyone lies. We lie because telling the truth would hurt someone's feelings. We lie about why we don't want to visit that relative we don't like. We lie about why we are returning an item to Amazon so we don’t have to pay the shipping. We lie because we learned at a young age that one way or another, it's to our advantage. Humans lie. Dogs don't. In fact dogs are incapable of lying. If they don't trust something or someone, they let us know with clear body language and emotionally based behaviors. And yet, humans try to train their dogs to lie everyday.
If our dogs exhibit fear aggression toward other dogs, people, the vet, children and so on owners respond with harsh words or leash corrections. We love our dogs, but, that's how desperate we are to teach our dogs to lie about their feelings.
Use good management to support and protect your dog. If your dog is exhibiting strong emotions and you'd like to improve them, call a professional for help.
And one more thing, believe the dog. Dogs don't lie.