It can lead to a slew of behavioral issues such as extreme separation anxiety, fearfulness, and lack of discipline. Other issues cited are escalating aggression between the puppies or panic when they are separated. Littermate syndrome is when two puppies from the same litter are raised in the same home and develop a bond with each other. 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. There are thousands of websites that discuss so-called "Puppy Littermate Syndrome". The signs of littermate syndrome vary from one case to another with some cases being more or less severe. Although many pups will have issues with training, you can usually spot the common signs of littermate syndrome pretty easily. I don’t know. A 6 week puppy course isn’t enough for some dogs. They never displayed fear or aggression, traits that are not common in the breed, but they also never doted on humans, a trait that is common to the breed. 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. These littermates are dependent on each other and suffer severe separation anxiety. 3. It is not. I could Google this to see if I can find studies, but I don’t put a lot of stock in the scientific evidence we can find online. First, what is littermate syndrome? 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. 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. The whole concept is based on "junk science". Littermate syndrome is the reason why it’s probably not a good idea to adopt two Dachshunds from the same litter. What each dog owner had in common was they weren’t working regularly with a dog trainer. Signs And Symptoms Of Littermate Syndrome. Breed characteristics, genetics and personality traits affect the likelihood of littermate syndrome developing. The most common definition is that it is when two puppies from the same litter are raised together and develop a bond with each other that prevents the puppies from bonding with the owner. Litter-mate "Syndrome" Litter-mate Syndrome . Littermate syndrome commonly occurs between Dachshund siblings raised together. This early bond to one another can cause dog on dog aggression in the future and prevent the puppies from bonding to you. It is common enough that many experts advise against adopting two pups from the same litter. Littermate syndrome. 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