Why Does One Dog Copy the Other Dog's Bad Behavior?

Dogs mostly catch each other's arousal rather than copying each other's habits. When your second dog starts barking at the window, he did not learn window barking by observation. He got wound up by the first dog's excitement and joined in, and after twenty or thirty repetitions the behavior became his own. This distinction matters because it tells you where to intervene, which is at the arousal, not at the imitation.

There is genuine social learning in dogs and it is real for some things, particularly following another dog through a door or to a location. But the everyday version people complain about, one dog picking up another's barking, digging, counter surfing, or fence running, is almost always the arousal route.

How it actually spreads

• Dog one reacts to something. A noise, a person, a squirrel.
• Dog two responds to dog one, not to the trigger. Watch closely and you will often see the second dog looking at the first one, not out the window.
• Both get aroused and the behavior is self rewarding. Barking feels good, running the fence feels good, and the thing outside always leaves eventually, which confirms it worked.
• It becomes independent after enough repetitions. Now dog two does it alone, and at that point you have two separate training problems rather than one.

The window where this is easy to fix is early. A dog who has joined in for two weeks unlearns it quickly. A dog who has been doing it for a year has his own history with it.

Break the pattern

1. Manage the shared trigger first. Frosted film on the bottom of the window, blinds down, gate the room, or block access to the fence line. Two weeks of zero rehearsal does more than any amount of training on top of a behavior that keeps happening.
2. Separate them for training entirely. One dog crated with a chew while the other works. Five minutes each, twice a day. Trying to train two aroused dogs at once does not work and it is where most people give up.
3. Fix the original dog's behavior on its own. The source matters. If dog one still explodes at the window, dog two is being pulled back in every time.
4. Then fix the second dog separately. Same protocol, run independently, with the other dog out of the room.
5. Put them back together last, and only after both can hold the alternative behavior alone. Expect a small setback when you do and do not read it as failure.

The mat is the tool that does this

Two mats, well apart, is the practical answer for most households.

Teach each dog to go to his own mat separately. Fifteen reps a day each, built up to a few minutes of duration, over about two weeks.

Then run them together on separate mats, starting at ten seconds and building. This gives each dog a job that is incompatible with charging the window.

Pay both dogs for staying, frequently. Every ten or fifteen seconds at first. In a two dog household the reinforcement rate has to be high or one of them will decide the window is more interesting.

Pay the non reaction. When something happens outside and both dogs stay on their mats, that is the moment food appears. Most households only interact with their dogs when the noise starts, which means quiet earns nothing.

The order the household falls apart in

Worth knowing because it tells you where you are.

• Stage one, dog one reacts and dog two watches. Easiest to fix. Manage the trigger and train dog one.
• Stage two, dog two joins in after dog one starts. Still straightforward. Separate training plus management.
• Stage three, dog two starts on his own sometimes. Now you have two problems, and it takes roughly twice as long.
• Stage four, they wind each other up as a pair. Each dog's reaction triggers the other and it self sustains. This needs weeks of separation before any joint work is possible.

Getting a second dog, briefly

Since this comes up constantly. If your current dog has a behavior problem, a second dog will not fix it and there is a fair chance the new dog picks up the arousal pattern within a few months.

Fix the first dog before adding a second. That is the honest advice even though it means waiting.

Watch which dog is actually driving it. In most pairs one dog is the initiator and the other is the follower, and people frequently get this backward because the louder dog is not always the one who started. Sit and watch three or four episodes without intervening and note who moves first. Whichever dog that is gets the bulk of your training time, because fixing the initiator quiets the pair.

And if the second dog is already here, separate training from the start. Two dogs trained together learn to work as a pair and struggle enormously when separated, which shows up the first time one of them goes to the vet alone. Solo walks, solo training, and solo time are worth building in from week one regardless of any of this.

Ready to train your dog?

Every drill in this article comes from the WorldWide K9 Academy course library. If you want the full step by step system, start with the $5 intro course.