Dog Attacking Other Resident Dogs?

I have a 10 year old JRT and an 8 yr. old Cockapoo. I got a Boxer x Mastiff and since the age of 6 months she has been attacking the 2 small dogs. She will pick them up by the back of the head and shake them. This has happened roughly 7 times! She is 16 months old now and just attacked the JRT again. Another time she just bounced on them. Other times they are fine together. She has drawn blood at times. What do I do to correct this or can I?


By L.M.

three dogs on couch

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April 8, 20150 found this helpful
Best Answer

What you are describing sounds like your boxer is using the smaller dogs as toys. Large breed dogs often carry cats by their heads.
Bouncing is simply what dogs do. They jump on each other. I bet your boxer mix doesn't realize she's gotten as big as she has.

Considering she's still a puppy, you should be able to fix it. When the puppy grabs a dog, bring yourself to your full height, stretch your arm out fully from your shoulder, point and say "Drop it!" in a stern voice.


Practice doing this with various toys and other articles until your puppy obeys right away.

Practice also the command "Sit!" so you can use it when your puppy is jumping.

Large breed dogs require more training and better behavior than small breed dogs because of their size. I suggest you ask yourself a few questions. Do you have any experience with large breed dogs? Are you willing to put in the extra time and effort it will take to train your dog to keep it from becoming a menace? Do you have the time? Be honest.

If not, the puppy is still young, and you can find it a home with someone who has a lot of experience with large breeds.
If you are willing to put in the extra time for training it will need, then you should start now. A six month boxer-mastiff mix is already a big dog and people will soon start to see it as a potential danger. Your dog could be in trouble with the neighbors and their pets if it doesn't learn some manners soon.

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April 9, 20150 found this helpful
Best Answer

The previous answer was excellent. As a retired AKC Boxer raiser-breeder (after 40+years) who also did many years of breed rescue, all I can add is the following:


Boxers and certain cross (like the Mastiff in your cross) breeds mature at a much later age than most dogs - a Boxer generally matures fully at around aged three years (although sexually mature at around aged 6-8 months, so spaying/neutering at that age is 99.9% of the time highly advisable). You should expect puppy behaviours like 'play fighting' for some time to come.

You don't mention her being spayed so I'm going to assume you've not had that done - do it now, as soon as you can. Sooner. That will help lessen her aggressive play with the others. It's not a cure by any means. Training is also a good step - if you haven't already, you should have her on a training course. Your local Leisure Services likely offers low-cost training courses for you and your dog.


The local library and the Internet are great sources of 'self-help' training information; your vet is always your first go-to for breed specific information and training suggestions. You must completely understand the breed specific needs of your dog - both Boxer and Mastiff breed traits and characteristics.

I can't stress how very vitally important training is - you will not be able to stop her wanting to be 'assertive' or 'aggressive' towards the other animals but you must be able to rely on her obeying your command of 'Stop!' 'Down!' and 'Come!'.

It should go without saying your cross Boxer-Mastiff must never again be left unsupervised with any other animal or vulnerable human - vulnerable is defined under US and UK (where I now live) as: child under 16 years, unwell/physically or mentally challenged of any age, and elderly.


Many locales in the US and UK have strict legislation against certain breeds and crosses. I don't think Boxer-Mastiffs have made that list yet but you should check with your local authorities to be sure. You may have to have specialised insurance, heavy fencing, etc including using leads and muzzles when in public or around the vulnerable.

If you feel all of the above is too much for your family to cope with, please find a reputable breed rescue group to rehome this dog to a home knowledgable about the cross and able to take on the tremendous responsibility.

To be completely clear - it's been my experience a Boxer-Mastiff (or Boxer-Staffie) cross should be the only companion animal in the family. Frankly, they don't usually 'play well with others'.

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