All About the Boxer Mastiff Mix

Do you enjoy large dog breeds? If you said yes, you will love the Boxer Mastiff mix, also known as the Boxmas. This mixed dog breed combines a Boxer and an English Mastiff together.

It is a newer mixed breed and is not recognized by the AKC. This dog will be larger than a Boxer but slightly smaller than a Mastiff.

Even though this mix s big, it is a big ball of fun and love. Loyal and friendly to adults and children, this dog will make a perfect family companion.

Are you still interested? If so, keep reading on to learn more about the Boxer Mastiff mix.

Boxer Mastiff Mix

Boxer Mastiff Mix History

Unfortunately, with most mixed breeds, there isn’t a lot of information on when it was first developed. While both parent breeds originated in Europe, many people believe that the Boxer Mastiff mix was developed in the United States.

Since there isn’t any information regarding the history of this mix, I will give you information about the history of the parent breeds.


The Boxer breed was actually created from an older dog breed that is now extinct. This extinct dog was used for various hunting of different types of animals.

The Boxer was created with the intention of keeping the natural hunting ability of the Bullenbeisser but also to establish a slender frame and to create a dog that wouldn’t be as big as that one.

After several breeding attempts, they got the Boxer that we know today, and it originated in Germany. The Boxer was going to be used for hunting as well as work. Today people typically have the Boxer breed as a companion dog.

The American Kennel Club accepted the Boxer in 1904. This breed still remains very popular to this day.

English Mastiff

The Mastiff is another very old dog breed, seen as far back as the B.C time period. The English Mastiff variety originated In England and was used for many different tasks.

English Mastiffs would protect the family and owner, protect the flock on the farm, and even hunt. During the time when Julias Caesar invaded Britain, he took some of these Mastiffs back home with him.

He saw these dogs fight alongside their owners and brought some to Rome, where they were used in the Arena fighting men and other wild animals.

Today you can still find the English Mastiff in England and throughout the world. The American Kennel Club accepted the Mastiff breed in 1885.

Boxmas Appearance

The Boxmas will also range dramatically in its weight. You can expect to get a dog that will be larger than a Boxer but may not be as large as a Mastiff.

Most Boxmas dogs tend to take after the Mastiff parent when it comes to the frame of the body. Mastiffs are very stocky and strong, and you will definitely notice this in this mixed breed.

Your dog will take after the Boxer parent when it comes to its facial features. You will notice a boxer face on your Boxmas with the hanging down folds.

The paws on this dog will be very large, especially when your dog is a puppy. Your puppy will grow into its paws; do not worry.

Mastiff Boxer Mix

Mastiff Boxer Mix Temperament

Even though the history of the parent breeds of this mix suggests that it has done a lot of fighting and hunting, it has a very calm and relaxed temperament.

Many people think that dogs with a background in fighting are automatically aggressive, which is not true. The Mastiff Boxer mix is actually very friendly, calm natured, and will make a very good family companion.

This mixed breed is also very loyal, which means if you do need your dog to be a guard dog, it can. You can still train your dog to be friendly around strangers and other dogs. Start doing that when your dog is a puppy.

Also, your Boxer Mastiff mix will be great with children, especially if you introduce your dog to children at a young age.

Personality of your dog will vary. Your dog may take on more traits of the Boxer or the Mastiff; it will just all depend.

Boxer Mastiff Mix Coat

Both the Mastiff and the Boxer breed have very short coats. These coats can be very dense and will require some maintenance to keep the coat free from the shedding hairs.

The coat will be straight and have a double layer. Your Boxer Mastiff mix will have some daily shedding but major shedding seasons in the spring and fall.

The coat can come in a variety of colors that you will see below.

What Colors Do They Come In?

Here are some of the colors that your Boxmas might come in:

  • Fawn
  • Brown
  • Brindle
  • Black
  • White
  • Tan

Your Mastiff Boxer mix will have the traditional brown eyes with a black nose.

Boxer Mastiff Mix In Costume

Boxmas Size

The Boxer breed weights a lot less than the Mastiff breed. Most Boxers weigh between 55 to 70 pounds and span 21 to 25 inches. The Mastiff can weigh between 75 to 160 and span between 24 to 26 inches.

When you mix these two dog breeds together, you will most likely get a dog that is bigger than a Boxer but not as big as the English Mastiff.

Expect your Boxer Mastiff mix to weigh between 70 to 100 pounds and span 23 to 26 inches. A female may also weigh slightly less.

Boxer Mastiff Mix Health Problems

If you have ever read any of my other mixed dog breed information pages, then you will know I always say that mixed-breeds help breed out certain health conditions.

My goal is still to keep you aware of the potential of your dog having certain health conditions. In no way am I saying that your dog will get any of these conditions.

Here are some common health issues that arise in Boxers and Mastiff’s:

Hip Dysplasia – A lot of medium to large breed dogs develop hip dysplasia. This condition is an abnormality that causes the hip bone to not fit correctly into its joint. This will cause excruciating joint pain and basically lameness if not fixed by a veterinarian.

Gastric Torsion – Gastric Torsion is also known as bloat, which occurs if your dog eats too quickly or when the stomach flips and even twists. This is a serious condition that can be life-threatening for your dog.

*It is very important to break up your large dog’s meals into smaller ones. Also, very important to not push your dog to do too much exercise all at once.

Brachycephalic – This is also known as the flat-faced syndrome, which means that the dog has a more pushed in face. It can make it hard for your dog to get air in and out. This is more common for the boxer parent and may carry over into the mix breed. Other brachycephalic dogs include pugs, French bulldogs, and bulldogs.

Ectropion – Ectropion is common in a variety of the Mastiff breeds. This condition is where the eyelid of the dog hangs own quite dramatically. This can make your dog more prone to eye conditions.

Bonus Tip: If you are ever worried about your dog, make sure you call your local veterinarian and express what your worried about.

Paws & Bones 2

Life Expectancy of a Boxer Mastiff Mix

It can be very difficult to determine the life span of a mixed breed dog. As a dog owner, you want your dog to be healthy, happy, and live a long time. Certain dog breeds live longer and some shorter.

The Boxer can typically live between 10 to 12 years. An English Mastiff can live between 6 to 12 years.

Plan on your Boxer Mastiff mix living between 6 to 12 years.

Living Conditions

Even if you own a smaller Mastiff Boxer mix based on the weight scale, it will still be better to live in a larger home. Large dogs do not do well in small cramped homes such as an apartment or condo. It would be ideal for you to live in a home that has a yard with it for your dog to run around in.

Keep in mind large dogs need more food and calories than a small dog. This can cost a lot in food expenses each month. If you cannot accommodate your dog with a high-quality dog food, consider getting a different breed.

If you own children, you can rest easy knowing that the Boxmas is very friendly with children. Even though some people tend to think of this mix as aggressive, they really aren’t unless raised to be that way.

This is a very loyal dog breed that will be by your side and bring you a lot of joy. If you are looking for a very large dog breed to not only protect you but also care about you, then you will love the Boxer Mastiff mix.

Boxmas Exercise

The Boxmas will generally need one hour of exercise each day. This is very important to get some of that pent-up energy out; that way, your dog will not be exhibiting destructive behavior outside.

You can provide your dog with this exercise requirement in a variety of fun ways. Some of the most common ways to give your dog exercise are through walks, jogs, or even with a simple game of fetch.

The use of toys is another great way to get your dog excited but also to exert some of that pent-up energy. Playing a game of fetch or even frisbee is a great idea for you and your dog. This will also help you both bond together.

Try to break up the exercise requirement into two or even more separate exercise sessions throughout the day. If your dog does too much exercise at one time, it can make your dog have trouble breathing; if your dog inherits the pushed-in face.

Boxmas In Costume

Mastiff Boxer Mix Feeding

All dogs are fed off of a weight-based diet. So, depending on your dog’s weight will reflect just how much food it will need throughout the day. Since the Mastiff Boxer mix is such a large dog breed, it will need between three and a half cups to four cups of high-quality food each day.

Again, please keep in mind to break up your dog’s daily nutrition into smaller meals to avoid the condition of bloat. You will also want to purchase your dog a high-quality brand of dog food that isn’t all protein but a good mix of protein, carbohydrates, fats, fruits, and vegetables.

If your Mastiff Boxer mix is still a puppy, you will want to feed your dog a large breed puppy food for at least the first year of its life. Then you can switch to a large breed of adult dog food.

Give your dog treats in moderation. Follow the 90/10 rule where your dog gets 90% of its nutrition from its quality dog food, and 10% is other things such as treats or dog safe human foods. Some safe human food for dogs includes jasmine rice and cheerios. Cheerios are really great to use as a training treat.

Boxer Mastiff Mix Grooming

Thankfully, this mixed breed has a short hair coat and won’t require a lot of daily grooming maintenance. You will have some minor shedding daily and much bigger shedding seasons in the spring and summer.

You will only need to bathe your Boxer Mastiff mix when it gets visibly dirty. I have a whole list of our recommended shampoos and conditioners that you can use for your dog.

Check your dogs’ nails frequently to make sure they aren’t getting too long. Sometimes very active dogs are able to wear their nails down naturally. Check periodically to make sure they aren’t becoming too long.


Mastiff Boxer Mix Training

Training is honestly necessary for a well-behaved dog. Most dog owners need to train their dogs, and you should definitely train your Boxmas.

It will be very beneficial for you to start training your dog as soon as you get it, whether it is a puppy or a younger adult.

You can start off with shorter training sessions to get your dog used to training. Always praise your dog during training; this also really helps enforce the idea of what you are training. Treats also help in this aspect to persuade your dog to listen to your commands.

Again, please do not force your dog to train if your dog isn’t feeling it. This can cause your dog to develop fear aggression, and you really do not want that.

This is a very smart mixed breed, but training may take some time and work.

Boxer Mastiff Mix Puppies

This is a newer mixed breed dog, so there are not a lot of breeders out there that create this mix. When you do finally find a breeder, make sure you ask the necessary questions to ensure the breeder is reliable, safe, and practices good breeding standards.

Some breeders may charge between $500 to $1,000 for a Boxer Mastiff mix. You may find a breeder that charges more, and chances are, if you do, one of the dogs is registered with the AKC.

Remember that you can always check local rescues to see if they have any Boxmas available. Usually, rescues are much cheaper, so that will be good for the budget.

Not all rescues will have puppies. It will be quite rare to find a puppy in a rescue. You will likely find a young to older adult.

Boxmas Mixed Breed

Boxer Mastiff Mix Litter Size

Litter size is a lot like life span and size, where it is very hard to determine. Since this is a mix, it is unknown how many puppies the female will have.

A Boxer female can have between five to seven puppies in a litter. A Mastiff female can have around eight or more puppies.


What is a Boxmas Dog?

Boxmas is the name associated with the Boxer Mastiff mix. Usually, mixed breeds get called a nickname instead of always having to say Boxer Mastiff mix. In this case, this mixed breed is called Boxmas, a mash-up of both parent breed names.

Are Boxer Mastiff Mixes Aggressive?

Any dog breed can be aggressive; while some dog breeds are more prone to aggressive tendencies, it really all depends on how you are raising your dog. The Boxer Mastiff mix does have a very protective instinct that makes it like a guard dog.

If you are worried about your dog becoming aggressive, you can take action by socializing your dog from a young age. Show your dog new people as well as experiences to get them used to that sort of thing instead of being scared.

How Big Will a Boxer Mastiff Mix Get?

The Boxer Mastiff mix is a large mixed breed dog. As you know, both the Boxer and the Mastiff are very large dogs, so the mix is bound to be large. The size of your dog will range, but you can expect your Boxmas to be between 70 to 100 pounds.
Boxer Mastiff Mix Pin

Key Takeaways

Here are the key takeaways about this dog breed that we discussed in this article:

  • This is a very large mixed breed dog. Make sure you have enough room to accommodate a possible 100-pound dog.
  • Training may take some time and effort. Once the training is complete, your dog will know a lot.
  • Very loyal dog that will be a valuable member of the family as well as a great family companion.
  • Perfect with children and other dogs if exposed to it from a young age.

Close relatives of the Boxmas

Below are some other dog breeds that are very similar to the Boxmas breed:

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