The owner may have a good reason for not wanting you to approach. For instance, the dog may not be comfortable around strangers.
Also, don’t smile, as that looks like you’re showing your teeth, a sign of aggression. [2] X Research source
On the other hand, if its ears go back or he growls, let the dog be. Backing up or cowering is also a bad sign from the dog.
If the dog shifts out of your reach a little or steps back, the petting session is over.
Watch for the dogs getting angry or aggressive. If either dog gets stiff or stands up taller, you should pull your dog away. Also look for flat ears, growling, or bared teeth.
Try to stay quiet while standing still.
The best way to break up a dogfight is to find someone to help you. Each of you should grab a dog by the back legs, lifting up and pulling back to remove them from the fight. [19] X Expert Source Colleen Demling-Riley, CPDT-KA, CBCC-KA, CDBCCanine Behavior Consultant Expert Interview. 25 March 2022. Try to move the dogs as far away from each other as possible. If you can only do one dog, pick the one that’s being the most aggressive. [20] X Research source
Other bad signs that may show up or develop in the following couple of days include swelling, redness, and increasing pain. If you notice these signs, you should see your doctor. [23] X Research source