How to stop 5-month pit bull puppy aggression towards other dogs?

I'm sorry that you're having this problem with Cssh! Aggression issues between dogs can be very complex, so without being able to actually meet him in person and observe his interactions with the other dogs, it's very difficult to say what might be causing this. Some dogs simply don't get along well with "new" dogs once they have grown out of their puppy stage - this could well be the case with your dog, since he's about 6-7 months old now. This isn't necessarily abnormal, but it may mean that your dog is not a good candidate for casual socializing with strange dogs. If you want to try and get a better idea of what may be causing Cssh's aggressive behavior and see if anything can be done to improve it, I would recommend making an appointment with a veterinary behaviorist - he/she can evaluate your dog in person and help you understand exactly what is happening. If needed, they can also help you put together a detailed plan to work on the problem. Your veterinarian should be able to find out where your nearest veterinary behaviorist is located, and set up a referral for you if you wish. In the meantime, I would recommend not allowing Cssh to interact with any dogs that he doesn't already know and like since there is a significant risk that he will continue to behave aggressively, which could cause injury to him or other dog.

It could honestly be a lack of socialization to other animals from a young age. Puppies should start to be socialized young and if they are aggressive, should be put into training with a professional behavioral expert. It could also be related to hormones, as I see Destiny isn't spayed.

This can be a very frustrating situation. Typically Lady is feeling threatened and possessive leading to aggression. I would highly recommend hiring a behavioral trainer to come into your house and help work through Lady's behavior. You can try adaptil a pheromone to help reduce stress and even increased exercise can help with anxiety but a trainer is the best option.

The answer very much depends on why he's aggressive (fear-based, territorial, play-based, etc) but my general recommendations are to stop ALL punishments, avoid anything that is causing aggression, and never allow him around children. Then you need to find a veterinary behaviorist to work with who can go over a detailed history and diagnosis and treat his issues. If you are unable to find a veterinary behaviorist, your vet may be able to start him on medications and talk about some behavior modification.

Thanks for using PetCoach! A couple ideas: try something like FreshPatch which essentially sends you a patch of real grass in a cardboard container. Or, try crate training since most pups will not pee in their “house”. Here is a good link for crate training. http://www.aahneenah.com/wp-content/uploads/2012/03/crate-training-your-puppy.pdf As far as the aggression, you’ll need to get that under control as soon as possible. Any form of aggression toward humans should be met with a firm “no” and stopping all play/walking. Practice just walking by and touching his back end frequently so that it’s normal and no big deal. Neutering often helps with aggression so keep that in mind. Finally, some dog require more intensive care so talk with your vet about anti anxiety medication or professional training.

This is not uncommon behavior for terrier types and I would expect it to settle down as they learn each others tolerances and limits. Enrolling in some puppy socialization classes would be worthwhile to help also

Hazel is adorable! As she is such a big dog and young I recommend you take her to a group obedience class. Then she can learn to behave with you on a leash with other people and dogs around. An experienced dog trainer can help you work with her to have her pay attention to you and ignore other dogs. As she is large and could hurt someone or another dog I would not take her to the dog park at this time. Also when walking make sure you use a no pull harness or pinch collar so you have control. I take many tasty treats and ask her to sit and look at you to get a treat when there are other dogs in the area. Offering her another behavior that you can reward is more effective instead of always saying no or correcting her. I'm sure you want a well socialized companion so please look into some dog training classes in your area. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Hazel.