How can I tell if my dog is uncomfortable when meeting a new dog?
An uncomfortable dog will lower her back side and will tuck her tail under. Ears are usually flat and she is looking around with big eyes. The insecure dog may bite, bark or growl at your dog. This is a good way to communicate her discomfort and your dog should back off. You may have to ask your dog to come to you to give the insecure dog some room to get comfy.
Never force a scared or unsure dog to interact with another dog. Sometimes when a dog is afraid and is forced to be around another dog or person, they will react aggressively and will bite. You do not want your dog to be in the middle of an aggressive interaction. They are not good for anyone involved. If you need to introduce two dogs and one is afraid, work with a professional behaviorist to make sure that you get the best outcome.
Signs of fear in dogs:
Work with a professional behaviorist or dog trainer to help your dog. Here are some registries of behaviorist and dog trainers in your area: