How to introduce a new puppy when my adult dog won't accept it?

It may take some time for her to accept him. If she is being aggressive toward him than you should not allow them to be together unsupervised, espeically around feeding time or any toys/bones that she may protect. Give her extra attention, praise, and treats while the puppy is around so she knows he is not there to replace her. You could also try an Adaptil collar or diffuser and see if that helps. If she doesn't start accepting him than you could talk to your vet about trying an anti-anxiety medication, like Prozac or Trazodone and see if that helps.

I'm sorry to hear that things aren't going well with your new dog. Unfortunately, it sounds like this may not be a good match - just like humans, some dogs have very different personalities and may simply not get along. If you want to try keeping both dogs, I would really recommend getting in touch with a veterinary behaviorist who can evaluate the dogs in person to give you a better idea of whether this is a fixable issue - if so, he/she can help you put together a detailed step-by-step plan to work on the problem. You can search for a behaviorist in your area here: www.dacvb.org In the meantime, I would recommend keeping your older dog on a leash or physically separated from the other dog with a baby gate or other barrier. This will allow the younger dog to relax a bit without being harassed. If things go well like this for a few days, you can gradually allow short periods of contact between them. Reward both dogs when they are together, and particularly praise and reward your older dog for calm behavior around the new dog. You may also want to try a DAP pheromone collar on both dogs, along with a natural calming supplement such as Zylkene or Composure for your older dog to see if this helps a bit.

What cuties!!! I would honestly be less worried about bringing a friendly adult dog into your house than a puppy because puppies can be overwhelming to adult dogs who are not used to them. They are hyper and jump and bite/chew on adult dogs and some dogs do not respond favorably to this (others are find and will give the puppy warnings or love playing with them). A great option in these cases is asking if you can do a trial run/foster for the new dog to see if they get along with your dog. This gives you a little time to make a decision. If your dog has been around other dogs without issue and this dog gets along with other dogs, then it is definitely worth a try! Make sure your current dog has the ability to get away from this dog if it is annoying/pestering her, do not leave them alone together initially, and feed them in separate areas so there is no fear of competition for food. Give your dog lots of praise and treats when she meets the new dog. Sometimes meeting on a neuteral ground can be helpful if your dog is defensive of your home. I would also consider getting an Adaptil collar or diffuser which can help both dogs with any anxiety https://www.adaptil.com/us/Products/ADAPTIL-Calm-On-the-go-Collar

Always introduce dogs in neutral territory. So, not on the property at all. Somewhere like a local park so they can meet each other without anyone being territorial. Do this a few times before moving in. Keep both dogs on leashes so you have control over them if things go awry. If the dogs are not spayed/neutered that should be done because raging hormones often causes fights especially when females are in heat. I would also suggest start using Adaptil diffusers (calming dog pheromones) in the house starting a couple days prior to moving and refill them every 30 days for the first couple months. I would also get Adaptil collars for both dogs to wear starting a few days prior to the first meeting. These particular calming chews (Solliquin) also help quite a bit. https://worldtails.securevetsource.com/site/view/198944_HomeDelivery.pml?s=adaptil&hierarchy=&sort=score%20desc https://worldtails.securevetsource.com/itemView/view/198944_HomeDelivery.pml?productId=117298

If your dog does not get along with other dogs it was probably a very bad idea (and a very stressful one) to bring a new puppy into the house. A new puppy can also be hard around a newborn as they aren't yet sure how to interact with each other. You can try to continue to get the two to get along by starting with limited introductions that are supervised, however if a fight breaks out the interaction should be stopped immediately and started again later. Never leave the two unsupervised together as even a good play sessions can cause accidental injury. You can also use baby gates as a way for the two to "meet" each other without being able to physically be together. If fights are continually breaking out, talking to a trainer or behaviorist that can observe within the home is best.

I'm not sure I understand your question. To clarify, your female dog does not like the male puppy? Unfortunately, some dogs will never like other dogs for various reasons (temperament, trauma..etc). Bully breeds are especially notorious for being best in single dog households (although keep in mind, dogs are all individuals). If the dogs are not spay and neutered, this can contribute to aggression but it may not fix the problem. Your best option is to work with a professional trainer or rehome one of the dogs if there is a danger of injury or harm to the dogs. I hope this helps and please feel free to post any additional questions.

I would probably separate them for awhile to help them get acclimated to the situation. Rocky may end up needing some anti-anxiety meds or a calming collar like adaptil to help him de-stress. I would start by introducing them with a door between them and hopefully Rocky will get use to the idea that the puppy isn't going anywhere and stop barking. If you thinks he needs anti-anxiety meds, I would talk to your vet for a prescription. I hope this helps!