How to stop my younger dog's possessive aggression towards older dog?
Hello, sorry to hear about your pups. It sounds like your younger one has some possessive aggression towards your older dog. Even if the biting isn't harmful now, it is a sign of potential aggression which can eventually escalate to something more serious. It sounds like this is triggered by you, treats and toys. There may be other things that can also trigger this behavior such as their food, a certain couch, bed, etc...
This may be a difficult behavior to modify, but here are some facts and hints about aggression and how to manage it. Hope this helps and best of luck.
Introduction
Aggression is a common problem faced by many dog owners. It is commonly misunderstood to be based in dominance. In actuality, there are various reasons that dogs can react aggressively. Most commonly these acts are based in fear or anxiety. This handout, will attempt to help you differentiate whether your dog’s aggression is based in dominance or another stimulus, like fear or possession. However it is not meant to replace visits and discussions with your veterinarian.
Common types of aggression
• Fear aggression:
Many commonplace human behaviors are threatening gestures to dogs, but their reactions are often times very subtle and easily missed by most people. Anything that can cause your dog to feel distressed or uneasy can illicit an aggressive reaction. Such things include: sustained eye contact, pressure over the top of the head, lifting the dog, bending over the top of a dog, certain force-based training techniques, or trying to take something of high value away from the dog.
• Territorial aggression:
Dogs can react aggressively when a person comes into an area that it regards as its home. There is often a basis of anxiety in dogs that have territorial aggression.
• Possessive aggression:
When aggression is directed toward a person that the dog views is approaching something of high value (food, toys, family members).
• Redirected aggression:
When the dog is frustrated by the inability to reach an object or person that elicits its aggression and instead acts aggressively toward a person that is within reach.
• Dominance aggression:
True dominance aggression is very rare. Most often aggressive acts are based out of another type of motivation. Usually what is assumed to be dominance aggression is actually based out of fear or anxiety.
What is your dog’s motivation for its aggression?
It is important to watch the body posture of your dog during a time of aggression to determine the underlying emotional state of the dog causing the aggression. Here are some examples of what to look for:
Fearful or submissive postures
• Avoiding eye contact
• Lowered head and tail
• T ense body posture
• Ears to the side, back or down
• Horizontal lip retraction
• Licking lips
• Yawning
• Crouched body posture
• Moving slowly or freezing
• Submissive urination
Dominant postures
• Sustained eye contact
• Ears erect and forward
• Vertical lip retraction
• Forward-leaning body posture
Updated on September 23rd, 2025