Bringing home two puppies means planning for each dog’s needs, both together and separately. Being littermates does not tell us exactly how they will behave, and a label cannot replace an individual assessment.
What people mean by littermate syndrome
The term is used for concerns such as difficulty coping apart, training challenges or conflict between young dogs raised together. Do not assume that every sibling pair will develop those problems, or diagnose the cause of an existing problem from their relationship alone.
Plan for two individuals
Make time for separate short training sessions, comfortable rest, suitable social experiences and gradual practice apart. Keep each puppy comfortable rather than suddenly forcing long separations.
Discuss vaccination and health precautions with your vet. Reward-based Puppy School can help with individual foundations.
Sex does not guarantee compatibility
Do not rely on a rule that two males will be easier, two females will inevitably fight or an opposite-sex pair will get along. History, health, development, the environment and the individual dogs matter. Discuss desexing and preventing unplanned breeding with your vet rather than expecting surgery to solve every behaviour concern.
Get help with distress or conflict
Manage food, chews and other valued items so the dogs are not placed in competition. Seek veterinary and individual behaviour advice for repeated distress, guarding or aggression. Do not make dogs fight it out or reach between them during an incident.
Further reading: Texas A&M veterinary guidance on puppy pairs; our time-apart guide.
Justin Jordan is a dog behaviourist and the founder of Jordan Dog Training, a family-owned Brisbane business. With more than 35 years of experience in the pet industry, Justin and his team help families with puppy training, everyday manners and behaviour concerns.
