Dogs will typically react aggressively towards other dogs for two reasons, fear, or they believe the other dog represents a threat. Your dog may perceive a threat to their status or safety, or they may even be protecting you against an apparent threat.
Why is my dog aggressive to some dogs and not others?
Aggression between unfamiliar dogs can be due to fear, poor communication, defensive, possessive behavior over resources (including perhaps family members or other pets) or territorial behavior over territory or owner. Aggression between dogs can result in injury to dogs and/or to the people trying to separate them.
Why does my dog only react to certain dogs?
Your dog’s behavior may also be about you, Dr. Crowell-Davis explains. “It could be that actually your dog is being protective of you in an almost possessive way and the other dog’s just minding his own business,” she says, and that your dog doesn’t want to be near that dog — or doesn’t want you to be near him.
Should I let my dogs play fight?
Play fight between dogs is only natural and should be allowed. It is a good exercise for your dog, a rehearsal for adulthood, and a good practice for socialization. However, play fights can sometimes turn into a real and dangerous fight.