Both my dogs are the same age, and after a third, older dog died, they began to fight — why?
Conflicts may occur between dogs when the dominance status is ambiguous or when they are particularly close in rank. After the decline, illness or death of an older dog, fighting may begin in the remaining dogs even when one is clearly dominant. This is because the older dog may have been dominant to both dogs, and now they are trying to establish new positions. In any case the fighting can be severe and injurious. Although you should generally attempt to allow dogs to resolve their differences on their own you will need to intervene if there is the potential for injury. Under no circumstances should the dogs be allowed to “fight it out”. You could be injured due to redirected aggressive attacks, or when you attempt to break up the fight (see below).
Can social aggression always be corrected?
Although dogs are social and live in groups, in a free ranging situation they would choose which group to live in and leave those where they are not welcome. Most people could not live together harmoniously in a small group arrangement with individuals someone else selects; we should admire our dogs flexibility that they are willing to let us pick their friends most of the time. However, some dogs will simply never be friends. Assessing the level of the threat and the potential for safety is the first step in determining the prognosis at least in the short term. Dogs that threaten but do not cause injury may learn to communicate in a way that avoids any further escalation to aggression, provided the owner does not intervene with normal communication and learning. On the other hand in some cases, even if the situations in which aggression might arise are infrequent if they cannot be predicted and prevented or if they lead to injury, (perhaps due to size or health differences or overly intensive responses on behalf of one or both pets) then the situation may be too dangerous to allow the dogs to be housed together. Identifying specific triggers or situations in which problems might arise, can provide a viable opportunity to be able to prevent and possibly improve the aggression. If predicting and preventing potential aggression is not practical, training and owner supervision does not ensure safety, problems cannot be improved with behavioral management, training and perhaps drugs or preventive products and preventive measures such as muzzles, crates or head halters cannot be effectively used to insure safety, then alternative housing may be required for one or more of the dogs.
How can I treat this problem?
Although the relationship between the two dogs must be dealt with, the first step is for the owner to gain complete control over both dogs. This should be accomplished through (a) verbal control with reward based training so that each dog can settle on command both in position (sit/focus) and on location (crate/mat) (see Teaching Calm – Settle and Relaxation Training), (b) a command-response program in which the owner controls access to all resources and all social interactions and ensures calm and deferent behavior before these are received (see Learn to Earn – Predictable Rewards), and (c) a daily routine that provides sufficient training, play and exercise sessions alternating with rest times where the dog can nap or play with its own toys (preferably in its own bed area) and (d) physical control and safety, preferably with a leash and head halter. The command-response program serves to eliminate all attention on demand. If your dogs learn that all rewards are provided only when you choose, this will likely reduce or eliminate some of those situations where challenges might occur. The leash and head halter provides a means of effective control as well as a way of separating the dogs if needed. With control of the head and mouth, aggressive threats can be curtailed and either dog can be placed in a controlled position, by pulling up on the leash, closing the mouth, looking the dog in the eyes, or pulling the head sideways so that the dog’s gaze is averted. Muzzles might be another alternative to keep people and dogs safe.
All situations in which aggression might arise must be identified and entirely avoided or prevented until such time as the owner has safe control for introduction. Identifying all stimuli for aggression is also essential in making a diagnosis, determining the prognosis and developing a treatment plan that deals with the specifics of the household.
Once you have gained sufficient control over both dogs, and have identified the more confident, assertive dog, you will need to deal with the circumstances that might elicit aggression. First, determine whether the responses of one or both dogs are appropriate or inappropriate. In those cases where the behavior appears to be related to resource value challenges, the approach would be to support the dog that is likely to be more confident dog in the relationship by discouraging challenges and approaches of the more subordinate that might progress to aggression. With the assistance of a behaviorist and a detailed description and/or video of the events, it should be possible to determine which dog is more able to take or maintain control. One option is to support the dog that has been in the household the longest; usually this is the oldest dog. Another is to identify the confident dog based on how the dogs interact, in other words, who threatens and who defers. In some cases the dog that is chosen could be the maturing younger, more physically capable dog, if this dog has been trying to assume control and shows appropriate responses. Care must be exercised to watch for dogs that try to take control but do not allow other dogs any status or are inconsistent in the application of threats (i.e., the bully). Dogs that are unable to read social communication signals appropriately (such as those that are older, unhealthy or infirm) also should not be chosen as the leader dog.
Ideally, the program should be passive and the dogs should be encouraged and reinforced for proper responses and problem free interactions. For example, if the more confident dog approaches or challenges the subordinate dog and the subordinate dog assumes a subordinate posture, the owners are not to intervene as long as the confident dog ceases the challenge. However, if dogs were able to work things out on their own, you would not likely be reviewing this handout. Therefore, every situation in which the dogs might become aggressive should be prevented or placed under owner control and supervision. Greetings should be low key, and both dogs should be ignored. If greetings are a problem, keep the dogs separate when you are out. Food, treats, toys, affection and resting places, can all be sources of competition and should be entirely under owner control. Movement through tight spaces must be avoided or controlled as there is more opportunity for confrontation and little area for the submissive dog to avoid or defer.
Although the goal is to prevent problems so that there is no further injury or occurrence, you will also want to work toward improving those situations in which the aggression might arise. If the specific times, places and stimuli that lead to aggression are predictable it should be possible to set up situations to teach the subordinate to defer (with the aid of verbal commands, such as down-settle or go to your mat, and a leash and head halter to ensure safe, immediate and effective control). Often your actions are inadvertently encouraging the subordinate dog to challenge to the more assertive. This might include providing attention, affection, play, food, toys or even a privileged sleeping location by your side. In principle, if any of these lead to problems, they should be provided to the more confident dog first and the subordinate encouraged to wait its turn. Often the submissive dog is willing to wait; it is often the people that want life to be fair so they coax and encourage a submissive dog to approach which only escalates the perceived threat by the other dog. Once you are finished, the more confident dog can be asked to do a down-settle while you provide similar resources to the other dog. If the confident dog begins to display threats or anxiety while you attend to the more subordinate, you will need to teach the assertive dog to settle when interacting with the subordinate (desensitize, countercondition) and you should ask the assertive dog to down stay further away or behind a baby gate. This might require two people and the use of a leash and head halter to ensure success. In the interim, removing the more assertive dog from the sight and sounds of the interaction might be best (e.g., outside, crating).
If problems arise during walks, it is usually best to start with two people walking the dogs (each person controls one dog) and not to allow them to forge in front of each other. Both should learn to walk on loose leash with no anxiety by the owner’s side. During feeding or when giving treats or toys keep the dogs at a distance, far enough apart that they do not show aggression. Slowly the dishes, toys or treats can be moved closer together as long as the dogs remain focused on their own items. Dogs can be taught to settle when they are in the same area or room with a down/stay and rewards. However, until they can be effectively trained another alternative is to attach their leashes to large pieces of furniture.
Social play should be allowed to continue as long as it does not escalate to aggression. If aggression is a possibility during play (or any other social interaction), you must be able to identify the signals and actions that indicate that aggression is likely to emerge so that you can stop the interaction. Generally starting with the subordinate, get each dog to settle before allowing further interactions to continue. This can be accomplished by using a settle command (with head halter if needed). However, if the more assertive dog increases its attacks on the subordinate as you begin to intervene, you may have to focus on getting the assertive dog to settle first (giving it preferential attention) or you may need more people to break up the play. During daily interactions, you should be cognizant of what interactions could possibly lead to fights or challenges. In any situations where problems might arise, allow priority to the confident dog, to approach, receive food or owner attention and affection. If you are petting the confident dog and the subordinate dog approaches, make it wait. If the confident dog signals to the more submissive dog to wait (by snarling, lip lifting, glaring or becoming erect) and the more submissive dog defers then you should not interfere!! Most people find this difficult but if you punish the confident dog and call the submissive dog to you (which is our human, life should be fair, response) then you will be inadvertently teaching the confident dog to be more aggressive and the subordinate dog to ignore his communication signals. If the dogs are likely to fight when you are away or at homecomings, separate the dogs whenever you are not available to supervise. Basket muzzles could be left on each dog to increase safety while the dogs are together making sure that the dogs do not become overheated while wearing a muzzle.
Dogs’ Sibling Rivalry is Leaving a Trail of Destruction | It’s Me or the Dog
Just like people, some dogs really struggle with sibling rivalry. In fact, dogs that go home with their siblings often struggle with aggression issues more than dogs who are raised without a “sibling” – whether or not they’re actually related.
In the latest “Ask a Trainer” question, we’re helping a reader troubleshoot the sibling rivalry between his two teenage dogs.
Dealing with dog-dog aggression and sibling rivalry isn’t easy. Get the help that you need with a Certified Dog Behavior Consultant in your area. If there’s no one near you, I can help.
Having two dogs that fight with each other is incredibly stressful for a home. Unfortunately, dog-dog aggression is often worst with dogs that are the same gender and the same age. Things can be even worse when the dogs are siblings.