Get

In Your Inbox

Dogster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Littermate Syndrome in Dogs: Signs, Causes & Management

Share

doberman puppies sitting

Littermate syndrome is a serious behavioral condition that occurs when two or more siblings from the same litter are raised together and form such a close bond that they get stressed when separated. They cannot form bonds with humans or other animals, and while it can be treated and overcome, doing so takes a lot of work and persistence. Owners must overcome the littermates’ reliance on one another while socializing dogs typically past the standard socialization window.

Read on for more information on this behavioral condition, including the signs and what can be done to combat it.

divider dog paws 3 oct 2024

What Is Littermate Syndrome?

Adopting or keeping two or more puppies from the same litter can seem like a good idea. They have company, and they already know one another, but it doesn’t always work out positively.

Littermate syndrome is a behavioral condition that occurs when two siblings from the same litter become too reliant on one another. Their dependence on each other is so strong that they do not form bonds with their humans and will not positively interact with people or with other animals.

Initially, it can seem cute that two puppies are so close, but over time, especially as the dogs get a little older, this can lead to serious behavioral challenges for the owners and dogs.

Akita puppies eating food_New Africa_Shutterstock
Image Credit: New Africa, Shutterstock

What Is the Cause of Littermate Syndrome?

There are no known physical causes of the condition. Dogs should be socialized from a young age, which means introducing them to people and other animals so they can form new bonds and experience new and potentially challenging situations. A dog with littermate syndrome fails to get this socialization and may struggle with related behavioral conditions.

Two or more developing puppies without the guidance of a mother often engage in aggressive play and feed on each other’s energy. This exacerbates any aggression-related problems against a third party.

If you have adopted one dog, it can be challenging to identify behavioral problems without knowing the dog’s history.

We recommend consulting a veterinarian if you have any questions or concerns about your pet’s behavior and need training guidance.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's our online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content Savings V1

Where Are the Signs of Littermate Syndrome?

Anxiety and signs of fearfulness typify littermate syndrome. These are most commonly seen when a dog is introduced to a new situation or meets new people or other animals for the first time. It will especially be a problem if they’re separated from their sibling. Common signs include:

  • Separation Anxiety: The dog will usually become anxious when separated from their littermate, even for a very short period. They can show extreme anxiety when left alone and may not eat, drink, or play with toys.
  • Poor Social Skills: Your dog may show signs of anxiety or, in some cases, aggression when meeting new people or being introduced to other dogs or animals.
  • Basic Training Issues: It can be difficult to provide basic training to dogs with littermate syndrome. They will look to their littermate for guidance and may not respond to commands and training provided by others.
grey and black neapolitan mastiff puppies
Image Credit: Fomin Serhii, Shutterstock

What Are the Potential Dangers of Littermate Syndrome?

Littermate syndrome can lead to heightened anxiety in dogs. They can become depressed and withdraw from their family. It can also lead to other behavioral problems and even aggressive behavior. The longer the problem is allowed to continue, the harder it will be to combat it.

divider dog paws 3 oct 2024

How to Manage Littermate Syndrome

Managing littermate syndrome requires separating the dogs, but it can lead to anxiety, so it needs to be done gradually and carefully. Try the following steps, and if in any doubt, consult a professional animal behaviorist.

  • Offer them time alone. Start gradually, but separate the two dogs for brief periods every day. Ensure that the two do not share a crate, have separate bowls, and are fed apart from one another. You can start by putting the bowls a few feet apart and gradually increasing the distance between the bowls before eventually feeding them in different rooms and even at different times.
  • Train them separately but within the eyesight of one another. Separate the dogs and give them basic training, but ensure they can see one another. You can gradually move the dogs out of eyesight, initially for a short period and then for longer periods as they get used to being apart.
  • Socialize them together. Take both dogs on walks and let them meet new people and other dogs. This will help them socialize without the anxiety that comes from being apart.
  • Walk them separately. It’s much easier to walk both dogs, but you’ll have to take them on separate walks to encourage more independence. Watch how they react when they’re alone so you can determine what needs to be done.
puppies coton de tulear
Image By: JacLou DL, Pixabay

Frequently Asked Questions (FAQs)

Can Puppies From Different Litters Get Littermate Syndrome?

Although littermate syndrome is most commonly witnessed in puppies from the same litter, that isn’t always the case. Two unrelated puppies of the same or similar age who form a very close bond when they are a couple of months old can develop the condition despite not being from the same litter.

How Far Apart Should Puppies Be to Avoid Littermate Syndrome?

Ideally, puppies should be 6 months apart to avoid developing the condition. Alternatively, if you want dogs of the same age, get them 6 months apart and ensure that they are both properly and separately socialized to prevent the problem from developing.

How Long Does It Take for Littermate Syndrome to Develop?

Littermate syndrome can start to develop from just a few weeks of age. Generally, it becomes a problem when puppies are still together after 3 months. This is when the dogs should be learning and socializing, and it is when the close bond can become a problem.

divider dog paws 3 oct 2024

Conclusion

Littermate syndrome is a serious behavioral problem that can develop when young dogs are brought up together and form too close of a bond. They do not get appropriate guidance or socialization and depend on one another for emotional and behavioral support. Once developed, correcting the issue takes a lot of work and time, but it can usually be corrected. Avoidance is better than trying to find a remedy, however. If you want two similarly aged puppies, ensure they’re at least 6 months apart and are properly trained and socialized individually.

See also:


Featured Image Credit: Pavel Shlykov, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything dog

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Dogster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

The Crate Setup Most Dog Owners Get Wrong (And How To Fix It!)

Most people assume that if their dog hates the crate, the crate is the problem. So they try a bigger one, a different...

1,500 Beagles Rescued from Wisconsin Lab Farm – Here’s Where They’re Going

You may remember that a few weeks ago, we reported on a tense situation at Ridglan Farms, Wisconsin, a facility infamous for housing...

Dogster’s Weekly Photo Contest Winners: Window Watchers (May 11, 2026)

Every week our team gets the privilege of sorting through our readers photos to choose what dogs will win this weeks contest! See...

Can a Relationship Work When One Person Doesn’t Like Dogs? Tips & When to Walk Away

For dog owners, a partner who doesn’t like dogs isn’t a minor quirk to overlook. Dogs aren’t a hobby you can scale back...

More related

Jumping Chihuahuas: Ned Finds a Loophole

Hi, I’m Dr. Karyn! Read my introduction to learn more about me and my five funny dogs, Poppy, Bailey, Kodah, Ned, and Fred....

10 Best Dog Supplements to Help With Shed Control in 2026: Reviews & Top Picks

We can love our dogs while admitting that we don’t love every aspect of pet ownership. Dealing with pet fur is an annoying...

How to Potty Train a French Bulldog: 8 Vet Approved Tips & Tricks

Small dogs are notoriously hard to potty train. Potty training a French Bulldog can seem daunting, but with patience, consistency, and the right...

How to Make Your Dog Live Longer: Our Vet’s 6 Tips to Increase Your Pup’s Lifespan

The good news for any new dog owner is that our dogs are living longer than they ever have! This is largely due...

Keep reading

What Is Ash in Dog Food? Vet Approved Facts & FAQ

If you’ve been checking out the nutritional label on your dog’s bag of food and your first thought was something along the lines of “What the…?!” when you spotted “ash” listed—you can stop worrying now. Dog food manufacturers are not...

Black Dachshund dog guarding and eating food

Your Dog Thinks French Fries Are Fine. Your Dog Is Wrong.

Has your dog ever given you that look? The one where their eyes follow every movement of your hand from plate to mouth. If it’s when you’re eating French fries, and they’re convinced with absolute certainty that fries are meant...

fork on french fries

Can Dogs Eat Pumpkin Seeds? Vet-Verified Facts & FAQ

Pumpkin seeds are one of the favorite healthy snacks for many people worldwide. While enjoying pumpkin seeds, you may have noticed your dog begging you for a bit of taste. At this point, you may wonder whether pumpkin seeds are...

Can Dogs Eat Pumpkin Seeds

Can Dogs Eat Raw Salmon? Vet-Verified Nutrition Facts & Advice

Salmon is packed full of healthy nutrients and is considered by some to be one of the healthiest protein sources since it provides essential vitamins and is a great source of omega-3 fatty acids. But what about raw salmon? Is...

Can Dogs Eat_salmon

10 Best Dog Foods for Chihuahuas in 2026 – Reviews & Top Picks

Choosing food for Chihuahuas is challenging because they are so small! The average dog food simply won’t work for them, as the kibble will often be much too big. Instead, only the smallest kibble size will do, or you’ll need...

close up Chihuahua eating

6 Best Dog Foods for Kidney Disease in 2026 – Reviews & Top Picks

Every dog parent dreads the idea of their dog getting sick, and kidney disease is no joke for dogs. As in the case of humans, this disease is not curable, but manageable. All we can do is make lifestyle changes...

Veterinarian examines dog in a veterinary clinic

11 Best Dog Foods for Beagles in 2026 – Reviews & Top Picks

Beagles are generally a healthy dog breed, but they can be susceptible to specific health conditions. Most Beagles tend to become overweight and obese pretty quickly, and a lot of them can have allergies and experience dry skin and coat....

Beagle eating from a bowl

What to Feed a Dog With Arthritis: Comprehensive Guide

An estimated 20% of dogs over 1 year of age have osteoarthritis, or degenerative joint disease (DJD), which is a progressive and complicated disorder. It can profoundly impact an animal’s quality of life and, sadly, has no cure. Instead, pet...

Disabled Senior Dachshund Dog Eating Pet Food At Home

Love Dogs? So Do We! Join the Dogster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Dogster Email Newsletter