Other issues cited are escalating aggression between the puppies or panic when they are separated. Littermate syndrome is a social 'disorder' characterized by intensive bonding of two littermates to the extent of excluding most animals and people out of their own social circle. Signs And Symptoms Of Littermate Syndrome. First, what is littermate syndrome? Littermate syndrome is the reason why it’s probably not a good idea to adopt two Dachshunds from the same litter. Litter-mate "Syndrome" Litter-mate Syndrome . Littermate syndrome commonly occurs between Dachshund siblings raised together. A 6 week puppy course isn’t enough for some dogs. Often, the extreme bonding can lead to training and socialization issues that may cause unhappy adopters to return one pup. Following a recent query from a concerned, prospsective, owner, I thought I would take this opportunity to dispel yet another commonly held belief, one which only serves to prevent good people from taking lovely dogs into their families. Although many pups will have issues with training, you can usually spot the common signs of littermate syndrome pretty easily. There are thousands of websites that discuss so-called "Puppy Littermate Syndrome". It can lead to a slew of behavioral issues such as extreme separation anxiety, fearfulness, and lack of discipline. I don’t know. This early bond to one another can cause dog on dog aggression in the future and prevent the puppies from bonding to you. The phrase has become so common in the "dogosphere" that many people -- even not a few vets, trainers, and breeders -- take it as a scientific term. Littermate syndrome is when two puppies from the same litter are raised in the same home and develop a bond with each other. Has Littermate Syndrome Been Studied by Scientists? It is not. What each dog owner had in common was they weren’t working regularly with a dog trainer. One of the most common signs of littermate syndrome is fearfulness around people or other dogs – this may also occur when the two puppies are separated from each other. It is very common for DHDR to receive owner surrender requests for one of two littermates when they reach about one year of age and problems start to become too difficult to overcome. While this syndrome is not conclusive for all littermates, it is common enough for many animal behaviourists and dog experts advise against it. Breed characteristics, genetics and personality traits affect the likelihood of littermate syndrome developing. These littermates are dependent on each other and suffer severe separation anxiety. 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