The Dark Side of Exercising Your Dog (The Stress Activity Paradigm)

Added: 2026-05-12

[00:00:00]I've spent years telling people exercise reduces anxiety, but I have started to question the universal truth of that.

[00:00:13]My life with my dogs is filled with activities. We run trails, we swim, we play tug, we explore.

[00:00:22]And they suddenly look like they do it all day if I let them. Then a few weeks ago, I came across a body of research that made me rethink how much activity they actually need. So, can too much exercise start pushing our dogs' brain towards chronic stress?

[00:00:43]So, if you own a dog, you've seen the advice, "Exercise your dog." But, how much? The internet seems weirdly united on this one. No matter how many articles I read, I kept landing on roughly the same answer, somewhere between 20 minutes and 2 hours of exercise a day.

[00:01:02]And I am usually the first person to champion movement with your dog. Running in particular has some remarkable effects on the brain. It reduces anxiety, improves blood flow, and promotes the growth of new neurons. But, if exercise is so good, where's the upper limit?

[00:01:24]So, [music] to look for answers, I disappeared into the world of science. And [music] what I found might surprise you. I stumbled across a line of research [music] showing that under the wrong conditions, exercise doesn't just become stressful, it can become deadly. And it's called the activity stress paradigm. Back in 1976, researcher William Pare gave rats free access to a running wheel. But, instead of having unlimited access to food, they gave unlimited access for 1 hour per day. Outside of that one feeding hour, all food was removed. Within about 5 days, many of the animals had literally run themselves to death.

[00:02:15]They developed massive stomach ulcers, enlarged adrenal glands, and stress hormone levels through the roof. What's weirder is that instead of conserving energy because of the limited feeding system, they ran more and more and more.

[00:02:32]Some even cut their precious meal time short just to get back on the wheel.

[00:02:38]Now, if you have a high-energy dog, you know how obsessed they can get with certain activities. They'd forget to drink water just to keep playing fetch.

[00:02:48]Some need to be dragged off the treadmill, and we associate that motivation with their genetics and their reward system. So, naturally, scientists also asked the obvious question, "Was this dopamine? Was exercise simply becoming addictive for these rats?" New scientist Dr. Kelly Lambert blocked dopamine signaling in the running rats.

[00:03:12]The excessive running dropped, but it did not disappear. So, dopamine was part of the story, but not the whole story.

[00:03:22]It seems that no single mechanism fully explains the rats' behavior. So, we need to look at the different stress model.

[00:03:30]Developing stress also has been shown in stress models where rats experienced inescapable shocks. However, if rats have been taught to press a lever to escape the shock, they did not get sick.

[00:03:44]So, why is it that restricted feeding triggers such a stress-inducing compulsive running activity, while rats pressing a lever to avoid an electrical foot shock did not? So, according to Dr. Kelly Lambert, the critical difference might just be the psychological sense of control.

[00:04:08]No matter how annoying it was every time the rats of the second stress model pulled the lever, they succeed in blocking the shock. In contrast, regardless of how much the other rats ran in the wheel, no food was presented.

[00:04:22]Rats are obligate grazers, and they need many small meals per day. So, the lack of control over their disrupted feeding rhythm might be a crucial factor in their maladaptive running behavior. So, of course, our dogs don't need multiple meals a day like rats do, but they seem to share one thing with every other animal on this planet, the need for some sense of control over what happens next.

[00:04:50]And when that sense of control disappears, is chronic stress maybe starting to creep in? And more importantly, does that make certain dogs easier to hook on high-intensity activities like fetch or running? To find out, I decided to track my dog Ollie, yes, this handsome lunatic right here, for 24 hours and take note of how often he actually controls what happens next.

[00:05:24]Let's go, baby.

[00:05:32]Good job.

[00:05:39]Nice.

[00:05:47]Okay, I'm not getting anywhere with just day-to-day activities. He might not be able to decide when exactly he can go out potty or if dinner is at 6:00 p.m.

[00:05:56]or 7:00 p.m., but because they all happen at reasonable intervals, it won't cause him any stress. So, I need something else. So, I needed a situation where the stakes were higher, which made me realize the best place to look was in daily life, but our training sessions.

[00:06:13]If there's anywhere I can measure how much agency Ollie really has over rewards and punishment, it's there.

[00:06:22]>> [music] >> No worries, I won't make you watch my entire training session, [music] and I'm far from the perfect trainer, but in everything I do with my dogs, I try to stay aware of the criteria [music] I'm setting. What exactly earns access to the reward, and what exactly [music] leads to punishment or the loss of opportunity for the reward. And if [music] I'm doing my job right, my dogs navigate our training with a high level of control [music] and agency. They're confident in their decisions, in their actions, and in our teamwork together.

[00:07:05]So, presently, I'm not too worried [music] that my dogs will develop an unhealthy relationship with exercise.

[00:07:10]>> [music] >> In fact, if you look at the brain, the body, learning, stress, resilience, even aging, you'd be [music] hard-pressed to find another behavior with as many broad benefits as movement like running. But, I can imagine situations where excessive exercise may be a behavioral outlet for a dog, a way of coping when control or meaningful choice are missing in other parts of life. No clear expectations, random rewards, inconsistent punishment, they are all kind of common scenarios for pet and sport dogs, and the resulting stress might not be deadly, but maybe significant enough to trigger maladaptive active behaviors. In environments like shelters, [music] puppy mills, or hoarding situations, exercise can absolutely be [music] enriching and therapeutic. But, under the wrong conditions, it may also be damaging. The brain will grab onto whatever creates [music] relief or temporary sense of control. And maybe that's the bigger lesson here.

[00:08:17]Nothing in behavior happens in isolation. No exercise plan, no training technique, no behavioral intervention, no supplement, no medication, none of it exists in a vacuum, and none of it will be the universal answer in every circumstance.

[00:08:35]That's it for today. I'm Dr. Melanie, and I'll see you in the next one.