Littermate Syndrome: Why Raising Two Puppies Together Isn't as Easy as It Sounds

In this guide

It is a common scene in Indian neighbourhoods: a mother dog has a litter, and a family decides to keep two of the puppies, reasoning that they will keep each other company while everyone is out at work or school. It sounds sensible, but raising two same-age puppies together, whether siblings or simply two young dogs of a similar age, carries a real risk of what trainers call littermate syndrome.

It isn't an official medical diagnosis, but it is a well-recognised pattern among behaviourists. The two puppies bond so intensely with each other that they struggle to bond properly with people, and often struggle to function independently at all.

Signs to watch for

Typical signs include real distress when the two are separated even briefly, fearfulness around unfamiliar people, dogs, or everyday noises, and training sessions that only seem to work when both puppies are present together, with one or both going blank when worked with alone. As the puppies mature, usually somewhere between six and eighteen months, conflict and fighting between the two can also emerge, sometimes linked to one puppy becoming noticeably more confident than the other.

Prevention and management

The most reliable prevention is simple: avoid bringing home two puppies of a similar age at the same time. If that isn't possible, or if two young dogs are already sharing a home, treating each one as an individual from day one goes a long way. This means separate feeding, separate walks, separate crates or sleeping spaces, and one-on-one training sessions for each puppy without the other present. It takes more time and effort than raising them as a pair, but it is far less effort than untangling littermate syndrome once it has set in.

If the pattern is already showing, it is not a lost cause. Consistent separate routines, ideally with guidance from a certified trainer experienced in the issue, can meaningfully improve both puppies' confidence and independence over time.

A simple weekly structure if you already have two

For families already raising two same-age puppies, splitting the week rather than trying to separate everything every day can make the routine easier to sustain. For example, each puppy could get one solo walk and one solo training session on alternating days, with feeding always done in separate rooms or crates regardless of the day. Even small blocks of one-on-one time, as little as ten to fifteen minutes, done consistently, do more for independence than occasional longer sessions done irregularly.

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