If you’re overprotective of your little dog, you can make the dog anxious and fearful. These feelings can make it overly aggressive towards other dogs.

Consider taking your little dog to the dog park or puppy training classes. These can also make you feel more comfortable about your little dog interacting with bigger dogs in a controlled environment.

Barking at other dogs Nipping or biting Jumping Growling

Be consistent when training your little dog. Your little dog should always know what to expect when it misbehaves. If your dog doesn’t do something and you just ignore it, this will cause the dog to become more dominant. [9] X Expert Source Sheri WilliamsCertified Dog Trainer Expert Interview. 28 April 2021.

Avoid hand-feeding your little dog its treats. Hand-feeding can contribute to the pack leader mindset that you’re trying to manage.

For example, you could set up a doggie bed in the corner of a spare room. If your dog tries to come into your room to sleep at night, return the dog to their space and close your bedroom door.

If your dog’s behavior doesn’t improve over time, put it in its crate for 5 minutes if it misbehaves. Ignore the behavior so it associates the misbehavior with a time out. Never hit or yell at your dog. Your dog won’t understand why you’re being aggressive and will only learn to fear you. [12] X Expert Source Sheri WilliamsCertified Dog Trainer Expert Interview. 28 April 2021.

For example, if you see people start to walk by outside, command your dog to go to its place or lay down.

If your dog is anxious, you may need to work with the vet to determine the cause of your pet’s anxiety. Your dog might need medication or behavior therapy.

If your dog’s behavior doesn’t improve, you may need to contact an Applied Animal Behaviorist (CAAB or ACAAB) or a board-certified veterinary behaviorist (Dip ACVB).

Keep your dog on a leash if it will encounter big dogs. For example, it’s a good idea to keep it on a leash while you’re still teaching basic commands. This way, you can move your dog away from other dogs if your small dog becomes aggressive.

Never give in to your little dog’s misbehavior. You’ll need to train your dog and never reward your dog when it tries to get your attention.

Talk with the vet about how to handle your dog’s separation anxiety. Crate training, downplaying your departure, and giving your dog plenty of exercise can all help.