Should You Get Two Puppies? A Look at Littermate Syndrome

We know the feeling — choosing just one Cavalier puppy is nearly impossible! Their sweet nature, soulful eyes, and gentle ways make every puppy tug at your heartstrings. So it’s no surprise that some families consider welcoming two siblings at once. While it can work beautifully for some, it’s worth understanding the concept of littermate syndrome — and how it may (or may not) apply to Cavalier King Charles Spaniels.

What Is Littermate Syndrome?

Littermate syndrome is a term used to describe potential challenges that can arise when two puppies from the same litter are raised together. It’s most commonly seen in more independent or high-drive breeds, and may include things like:

• Over-attachment to each other and distress when apart

• Delayed training progress

• Difficulty socialising with humans or other dogs

• One puppy becoming more anxious or withdrawn

That said, it’s important to note: this is not a guaranteed outcome, and not a clinical diagnosis. It’s simply a pattern that has been observed in some dogs — especially when the puppies aren’t given individual time and training.

Is Littermate Syndrome Common in Cavaliers?

Here’s the good news: it’s quite rare in Cavaliers.

As a breed, Cavaliers are naturally gentle, people-oriented, and adaptable. They tend to bond deeply with their humans, even when raised alongside a sibling. In our experience here at Sielle Place Cavaliers, it’s extremely uncommon to see true signs of littermate syndrome in this breed — especially when thoughtful socialisation and training are in place.

That said, even the most easygoing breeds benefit from structure and individual time, so we do still encourage some intentional separation early on, if you’re raising two together.

If You’re Thinking About Two Puppies…

We’ll always support you in making the best decision for your family and lifestyle. If you’re considering two puppies, we’ll talk you through it honestly and offer tailored advice. Some things we suggest include:

• Feeding in separate bowls

• One-on-one time with each puppy for training and bonding

• Separate outings for confidence building

• Being mindful of their individual personalities and pacing

Some families thrive with a pair of Cavaliers — particularly when they have the time, patience, and understanding to nurture each puppy as an individual. Others find that raising one pup first, then adding a second later, feels more manageable and rewarding.

Our Approach at Sielle Place Cavaliers

We don’t have a blanket policy against placing two puppies together — because every family and every puppy is different. What we do promise is to guide you with care and honesty. We’ll talk openly about your household, time availability, training experience, and goals. And if two puppies is the right fit for you, we’ll help set you up for success.

At the end of the day, our goal is to raise confident, well-adjusted Cavaliers who thrive in your home — whether you bring one home or two. Littermate syndrome is something to be aware of, not afraid of. With guidance, patience, and the naturally sweet spirit of the Cavalier on your side, most families find the journey joyful and smooth.

If you’d like to chat more about the idea of siblings, we’re just a message away.