Dog peeing, anxious with new puppies. How to help them get along?

This definitely can be happening because Buddy is feeling uncomfortable. I would continue to have monitored meet and greet sessions, and if someone becomes too nervous or starts to try humping behavior, separate and let both dogs relax. Sometimes, dogs do well with mutual activities such as a walk or running around a backyard as this can help them focus on something else (the walk) instead of focusing entirely on the other dog. This may also help nervous dogs calm down a little by changing their focus. It does take time for dogs to get used to each other, so keeping up with the meet and greets, adding in a mutual activity, and providing places for both dogs to go and relax on their own without the other bothering them is best. I would not discipline the behavior, especially if your dogs are trying to communicate their needs to each other, and instead just calmly separate, allow them to calm down, and then reintroduce.

if Prince is not neutered, this may be the reason behind the behavior. Neutering Prince will help but the behavior will not change over night. Here is a link about introducing dogs: https://www.petcoach.co/article/5-tips-to-introduce-a-puppy-or-dog-to-your-older-dog/ Make sure to monitor all interactions to prevent injury. Keeping Prince on a leash will help you to provide better control. Making sure both pets are well exercised prior to the meeting can help as well. Do not leave the pets together unsupervised. Best of luck.

Aggression is complicated because it can be playful aggression, dominance, possessive or anxiety. Unless you are very familiar with canine behavior, training and body language, this is a situation that requires a dog trainer. The trainer will watch Trevor’s behavior and then will teach you how to modify your behavior to change his. You should also get a few books about dog behavior and training so that you can learn how to recognize the body language as this will help. Neutering Trevor can also help to decrease unwanted behavior. I hope this is helpful and please feel free to post any additional questions.

It sounds like Gizmo could benefit from both some basic obedience classes, and talking with a trainer or animal behaviorist in person, especially if his behavior is worsening or not improving with home-training. This can help increase his social skills in a structured and supervised setting and may help with overall confidence, greeting people, leash walking, and manners. If he is also having accidents in the house suddenly, or has had a sudden change in behavior, ruling out any health issues is a good step as well to make sure there isn't an infection or other underlying problem that could be causing the changes.

Fear and aggression are both often due to underlying fear and/or anxiety. Working with a trainer will help you learn how to correct behaviors in a way that doesn't exacerbate anxiety or fear. It may be helpful to discuss anti-anxiety medication with your veterinarian as well. What you are describing is not normal, but working with behavior modification techniques and possibly with medication could be very helpful. Best of luck with him. https://www.petcoach.co/article/6-common-myths-about-dog-aggression/ https://www.aspca.org/pet-care/dog-care/common-dog-behavior-issues/aggression

Is there a reason you are not planning on desexing the older dog? Unless you are planning on breeding him it is best to have him castrated. This behavior of urinating on the puppy is a dominance behavior and it will only get worse. It is best to "nip it in the bud" and the way to do that is to have him desexed. The snapping at the puppy is also worriesome and a sign of aggression/dominance. I'm glad he seems OK now but this behavior could escalate especially as the younger puppy gets older and comes into sexual maturity himself. Just something to think about. Hope this helps. Best wishes.

This is likely a behavioral issue that will be a hard habit to break. He is probably being territorial, and being intact will increase his behaviors. You can try neutering him, removing the female, or confining him when he cannot be monitored.