Barking
Why do my two dogs set each other off barking?
Last updated 23 September 2026 · How we write and check this
Short answer
Dogs living together often synchronize their alert responses, so one dog noticing a trigger and barking prompts the second to join in automatically, even without independently noticing the same thing. This social contagion effect means addressing only the dog that reacts first often resolves both dogs' barking at once.
Identifying which dog starts it
Watching several episodes closely usually reveals one dog consistently triggers first, often the more naturally alert or territorial of the two, while the second joins in reactively without necessarily noticing the original trigger independently.
Training the first responder specifically
Focusing training effort, distance work, a quiet cue, or trigger management, on the dog that starts the chain usually reduces overall household barking more efficiently than trying to train both dogs equally on every trigger separately.
Rewarding the second dog for staying calm
Separately, reward the second dog specifically for not joining in when the first one barks, since this teaches an independent skill, staying calm despite a housemate's excitement, that helps even once the first dog's barking has reduced.
Key takeaways
- One dog usually triggers first, with the second joining in through social contagion rather than independent noticing.
- Identifying and training the first responder often reduces barking from both dogs at once.
- Rewarding the second dog for staying calm during a housemate's barking builds an independent skill.
- Addressing the chain as a pair, not two separate identical problems, is usually more efficient.