Question
I have a German Shepherd (7 months) and a Presa Canario (9 weeks). Both females.
Right now they are both getting along great and I am doing my very best to socialize them.
At what age do I need to start worrying about dog aggression, especially from the Presa Canario?
Answer
Inter-dog aggression occurs much more frequently in non-neutered male dogs. Usually signs start appearing when the dog reaches puberty (between six and nine months old) or becomes socially mature at 18 to 36 months- depending on how fast your dog matures. In my experience having one dog desexed and the other entire both of the same sex also increases dog on dog aggression if they are both adults, especially if humans try and keep the desexed dog at a higher rank. As you are raising them together, they shouldn't become aggressive to each other.
I haven't heard of dogs that are fine when humans are around and aggressive to each other when alone. Have heard of dogs that fight over their human and are fine alone. So you should see them fighting if there are problems.
I know some owners prefer to wait till their male GSD are 2yo before desexing to ensure that they look as masculine as possible. Aggressive females can become more aggressive when spayed so that is a good reason to get your Presa Canario spayed sooner rather than later to prevent her becoming aggressive.
Answered By - SAM A