Behavior & Training
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The email described a familiar scenario: “We were planning to adopt one puppy, but the breeder said that raising two sisters would be easier. After we brought the girls home at nine weeks, their behavior became increasingly out of control. My husband and I could not get their attention for more than a second or two—it was as if we weren’t even in the same room. And then they started displaying alarming fearfulness of people and other dogs.” I made an appointment for a home visit so I could meet the family and the puppies.
Many dog behaviorists, trainers, breeders and shelters discourage adopting siblings. Anecdotal evidence suggests that behavioral issues may arise during key development periods because the two puppies’ deep bond impedes their individual ability to absorb and grasp the nuances of human and canine communication. Since fear is the canine’s default reaction to odd or unfamiliar stimuli, this muddled understanding of the world around them can lead to impaired coping mechanisms later on.
Of course, many factors influence behavior, and not all siblings raised together will exhibit this problem, which is called “littermate syndrome”; it’s a risk, not a foregone conclusion.
Dunbar points out that raising littermates necessitates training two puppies, which is particularly challenging when they’re essentially wearing blinders to all but each other. “It’s more than twice the work; it’s exponential. The two combine to produce levels of energy that we can barely measure. Tension develops in training and compliance as they squeeze the owner out of the relationship. They’re always living with an enormous distraction: each other.”
The Tie That Binds
Wilde believes the problems are rooted in hyper-attachment, which leads to hindered social development and communication issues. “People assume that having two same-age pups who play together and interact constantly covers their dog-dog socialization needs, but they in fact don’t learn how other [dogs] play and have no idea about social skills with other puppies, adolescents or adult dogs. Perhaps one puppy is a bit of a bully, which his littermate puts up with, but his rude behavior might not be tolerated by a new dog in a new setting.”
During my appointment with the family, we determined that the best course was to rehome one of the 12-week-old siblings. Dunbar agrees that it’s often best to separate littermates, especially if symptoms appear early, so that each has a chance to develop normally as an individual. This is obviously a burdensome decision for the overwhelmed owner to make, a sort of canine Sophie’s Choice, so he recommends that potential new owners meet both puppies and determine which to take home.
Dunbar, too, is adamant that one of the key lessons a puppy must master is how to be content with being alone, which is all but impossible with two siblings. “Once we’ve done that, yes, he can live with other dogs and have free run of the house. But if you don’t teach puppies early on how to be alone, and especially with siblings who have always been together, it will be catastrophic when one dies.” Dunbar encourages multiple dog households— “I always like having three dogs”—but the timing, temperament and age that each enters the home is paramount.
Most people have never heard of littermate syndrome, finding out about it while researching their dogs’ problematic behaviors. Increasingly, however, trainers and behavior professionals recognize that the cons of adopting siblings far outweigh the pros. “The only advantage I can think of is a short-term gain of the puppies being less lonely in the first month of life,” says Dunbar. “Everything else is a loss.”
Exceptions and Hope
Myriad factors affect dog behavior, including genetics, early life experiences and owner engagement. As University of California, Davis, veterinary behaviorist  Dr. Melissa Bain points out, “Two fearful littermates very well may be genetically predisposed to fear.” Bain is less inclined to apply the term syndrome to the set of symptoms. “It makes you think all littermates have problems, which is not the case.” She also emphasizes that the level of owner involvement is key, saying, “The symptoms escalate when the owners treat them as one dog with eight legs.” When conflict ensues between the pair, Bain believes it’s due to the dogs being similar in size, age and gender. “This uniformity makes it difficult for the siblings to delineate a hierarchy,” she said.
After one of the siblings had been rehomed, I received an email from the owner describing how the remaining puppy began to thrive under a remedial socialization program. “Dora has blossomed in the last three months into a delightful household companion, and she continues to improve. She now approaches people out of curiosity. We know she would still be fearful had we not separated the two before it got any worse. Dora has become more confident with all kinds of dogs, and successfully completed a group obedience class.”
While siblings blessed with extraordinary genes and socialization-forward owners may avoid littermate syndrome, the consensus among canine professionals is that it’s not worth the risk. Most would encourage new owners to adopt a single puppy who suits their lifestyle and to focus on the training and socialization that strengthens the interspecies bond unique to humans and dogs. Once your puppy is a dog, by all means, get a second, since the two will be at completely different stages, and the older one may very well emerge as a great life teacher to the younger.
Photo by Anna Hoychuk