Why Is My Female Dog Suddenly Aggressive Toward My Other Dog

Why Is My Female Dog Suddenly Aggressive Toward My Other Dog

It can be quite distressing for pet owners when their female dog suddenly displays aggression towards their other dog. While dogs are generally social animals that enjoy the company of their own kind, there can be various reasons why a female dog might become aggressive towards another dog in the household. Understanding these reasons can help pet owners address the issue effectively and ensure a harmonious environment for all their furry friends.

1. Hormonal changes: Female dogs undergo hormonal changes during their heat cycle, and this can sometimes trigger aggressive behavior towards other dogs, especially if they are intact (not spayed). These hormonal fluctuations can make them more irritable and possessive.

2. Resource guarding: Dogs can become aggressive when they feel the need to protect their resources, such as food, toys, or their favorite resting spot. If a female dog perceives the other dog as a threat to these resources, she may exhibit aggressive behavior.

3. Fear or anxiety: A female dog may become aggressive towards another dog if she feels threatened or fearful. This can occur if the other dog has displayed aggressive behavior towards her in the past or if she has had a negative experience with other dogs.

4. Lack of socialization: Dogs that have not been properly socialized with other dogs during their critical development period may not know how to interact appropriately with them. This can lead to fear or defensive aggression when encountering other dogs.

5. Medical issues: Sometimes, underlying medical conditions can cause a dog to become aggressive. Pain, discomfort, or changes in the dog’s health can make them more irritable and intolerant of other dogs.

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6. Changes in the household: Major changes in the household, such as a new baby, moving to a new home, or the addition of a new pet, can disrupt the established hierarchy and trigger aggression between dogs vying for dominance.

7. Breed tendencies: Certain dog breeds have a predisposition towards aggression, and female dogs of these breeds may exhibit aggression towards other dogs. It is important to consider the breed characteristics and temperament when addressing aggression issues.


1. Can aggression between my female dogs be resolved?
Yes, with proper training, consistency, and patience, aggression between female dogs can be resolved. Seeking guidance from a professional dog trainer or behaviorist is recommended.

2. Will spaying my female dog help reduce aggression?
Spaying can help reduce aggression in some cases, particularly if it is related to hormonal changes during the heat cycle. However, it may not resolve aggression caused by other factors.

3. Should I punish my female dog for aggressive behavior?
No, punishment is not recommended as it can worsen aggression. Instead, focus on positive reinforcement and reward-based training techniques.

4. How can I prevent aggression between my female dogs?
Ensure both dogs receive proper socialization, provide separate resources, and establish a structured routine. Seeking professional help can also be beneficial.

5. Can aggression between female dogs be a sign of a larger issue?
Aggression between dogs should not be taken lightly as it can escalate and lead to serious injuries. It is important to address the issue promptly and seek professional assistance if needed.

6. Will separating my female dogs resolve the aggression?
Separation alone may not resolve the aggression but can be a short-term solution to prevent any further incidents while working on behavior modification.

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7. Can medication help with aggression issues?
In some cases, medication prescribed by a veterinarian can help manage aggression by reducing anxiety or addressing underlying medical conditions. However, it should always be combined with behavioral training.