How to stop my 3-month-old puppy from aggressive growling at family?

At this point, I think you need to have a professional trainer/behaviorist examine your dog and try to come up with a training plan. That is very concerning that she is aggressive and I think you need some professional help before someone in your family is injured. Call your vet and see if he/she can recommend a good trainer in your area.

I strongly recommend you consult with a professional, in-home dog trainer. You need a trainer to come to your house so they can see the behavior and the interaction of all the family members with Max. This is your best bet. Aggression problems need special care and it is not recommended that you try to correct this on your own. You may give him the wrong signals and make him worse. Especially with his breed you need to do this correctly and since his life start was not good that plays into his issues. This is a situation that definitely needs professional intervention. I suggest you call your vet to get a referral for a trainer or do an online search for trainers in your area. Best wishes.

It sounds like Muggs is bring quite seriously aggressive. Firstly you should have him checked by your vet for any medical reason that could explain his behaviour. Following that you need to go back to basics with his training and give him the confidence not be nervous. In a difficult situation like this I would highly recommend employing the service of an animal behaviourist. Your vet may be able to help by prescribing medications but it usually comes down to behaviour and training.

Actual aggression in a two month old dog is highly unusual, and a definite sign of bad things to come unless it is nipped in the butt immediately. I would highly recommend obtaining professional help from a behaviorist or dog trainer before Blue turns in a large adult dog with behavioral issues. In the mean times, do not interact with Blue if he shows any signs of aggression what so ever. You do not want him to mistake attention given to him as a reward. Typically I never recommend punishment since it is not as valuable a tool as positive reinforcement. However, in extremely young puppies such as these sometimes punishment can be effective. Once again, professional assistance is highly recommended in this instance. Hope this makes sense.

I would take steps to curb this behavior. If you are her primary caregiver, have them take more of a role in her life. Have them feed her, play with her and be more interactive. Puppies do growl in play but it sounds like this isn't the case with her. The idea is to have whoever she seems to have an issue with become the people that good things come from. Treats, toys, play, even her food should be provided by them and therefore get her to trust them.

I'm sorry to hear that you're having this problem with Champ! Unfortunately, aggression towards humans and other dogs is a complex behavior issue that can be caused by many different things. In most cases, it's related to stress or anxiety - treatment is usually based on trying to identify what situations trigger the aggression, then either avoiding them or teaching the dog to be more comfortable in these situations through reward-based training. It would be best for you to find someone who can work with you in person on this problem, so I would recommend asking your veterinarian if they can refer you to a good behaviorist or trainer in your area. Ideally, try to make sure that the trainer does not use any type of punishment - aggressive dogs should be handled with reward-based techniques only, as corrections tend to make this behavior worse over time.

Oh dear! Growling when you pick her up is a major red flag for future problems in a puppy this age - this is not normal, and needs more help than just socialization. From your description, it's hard to say if her behavior with the other puppy is normal play or aggression. I would strongly recommend making an appointment with a veterinary behaviorist who can evaluate her in person and help you put together a plan to work on these issues - it's best to do this as soon as possible, since early intervention gives you a much better chance of being able to change this behavior before she grows up. I'm not sure what part of Canada you're in, but your regular veterinarian should be able to help you find out where your nearest board-certified veterinary behaviorist is so that you can make an appointment. In the meantime, I would try and avoid doing anything that tends to make her growl - instead of picking her up, for example, use treats to encourage her to come to you. I would also not recommend any kind of punishment for this behavior, as this has a high risk of making things worse over time. The behaviorist can help you identify what kinds of situations tend to trigger the growling, and will put together a training plan to work on this issue.