08/08/2026
Getting two puppies at once sounds like double the fun - and it is - but trainers, behaviorists, and most good breeders will tell you not to do it. It's not about the extra work, though that's real too. It's about how puppies develop.
The main issue has a name: Littermate Syndrome,It doesn't just apply to actual littermates, it can happen with any two puppies raised together at the same age.
1. They bond to each other, not to you
Puppies have a critical socialization window from about 8 to 16 weeks where they learn who their family is and how to navigate the world. When two puppies are always together, they become each other's security blanket.
That means:
- They look to each other for cues instead of looking to you, which makes training much harder
- They can develop extreme separation anxiety when apart, even for a vet visit or crate time
- They often don't bond as deeply with their humans
2. They can hold each other back socially
Instead of learning to be confident around new people, dogs, sounds, and places, they have each other to hide behind. One often becomes the bold one and the other becomes the shy, dependent one. Neither learns to be a stable, independent adult dog.
And as they hit adolescence, around 6-14 months, that close bond can flip to conflict. Littermates raised together have a much higher risk of intense sibling rivalry, resource guarding over food, toys, you, or space, and fights that can become serious and hard to fix.
3. Training is not 2x harder, it's 4x harder
Everything has to be done separately if you want to do it right:
- Separate crates in separate rooms
- Separate walks, separate training sessions, separate socialization outings
- Separate playtime and downtime with you one-on-one
If you train them together, one is usually distracted by the other, and you can't reward timing correctly. Most people simply don't have 4-5 hours a day to give each puppy the individual attention it needs in that first year.
4. You get two adolescents at once
Puppies are cute at 10 weeks. At 9 months, you have two large, hormonal, boundary-testing teenagers who feed off each other's energy. Barking, pulling, jumping, and chewing all get amplified when there are two.
Then there's the practical side: double vet bills, vaccines, spay/neuter, food, boarding, and if one gets sick with something contagious like kennel cough or parasites, the other almost certainly will too.
Does it ever work?
Yes, but only when people commit to raising them almost as if they live in different houses for the first 12-18 months. Separate everything, structured alone time every single day, and a lot of professional training help. That's why many responsible breeders have a policy of not placing two puppies in the same home.
The approach that works much better for most people: get one puppy, put in the work for the first year to 18 months to raise a confident, well-trained dog, then add a second puppy. The older dog actually helps teach the younger one, and you already have a solid bond with the first.
If you already have two or you're set on it, the key is separation as a routine, not a punishment. Crate separately, feed separately, train separately, walk separately at least once a day. And get a trainer involved early, before problems start.
