Hi I have a lovely, friendly fox red lab, who's now 18 months old. We also have a calm, 5 year old black lab. She's full of energy, despite regular walks and jogs off the lead. I have recently noticed she can feel a bit threatened when meeting other dogs and I am unsure how to handle this. Any advice much appreciated! If she is approached by several dogs when she is off the lead, she stands very alert and if the other dogs want to play she can react by showing her teeth. This is worrying me. Also if there is a very playful dog, she will happily play but can become over excited which can result in barking/showing off teeth again, as if she feels threaten. She normally plays really nicely, both with our other lab and most other dogs. Just some dogs seem to make her feel uncomfortable. I want to stop this behaviour before it becomes worse.