This article is from the Rottweilers Breed FAQ, by email@example.com (Denise Gross).
Problems should be minimal when a Rottweiler is raised from puppyhood
with other pets. Introducing a new pet when there is an adult
Rottweiler in the household should be done slowly and with care. Dog
to dog aggression is influenced by the early socialization of puppies,
their bloodlines and sex; males are less tolerant of other males than
they are of females. Bitches may also be intolerant of other dogs. The
Rottweiler is highly intelligent and trainable, and with
perserverence, should be able to learn to co-exist peacefully with any
pet you wish to introduce.