"How Much Should my Mastiff Puppy/Dog Weigh?"

As a breeder, I am often asked,” What is the average weight for a Mastiff Puppy/Dog?” My answer is that it depends on a couple of factors—the sex of the puppy, the overall bone size of a puppy, and the overall condition of the puppy.

In our breed, Mastiffs do often have a “size” difference between the males and females. Males do tend to be bigger, have larger heads, and have larger bone. Thus, as a general rule, on the average a male is going to weigh more than a female. However, there are girls who are every bit as large as the boys.

You will hear Mastiff breeders talk about “bone size”. Generally, what they are referring to is the overall circumference of the leg bones. One can see Mastiff with thin spindly reed--like legs to dogs with huge, fence post sized legs. Of course a dog with larger bone is going to weigh more—bone weight is heavier.

Puppies who are raised with not enough to eat and/or who are feed inferior food; puppies who are not wormed and stay infested with internal parasites; puppies that are kept in unclean surroundings under stressful conditions, will all have less growth and overall size at adulthood. Puppies that are sickly will be smaller as adults. This is especially true if this occurs during a rapid growth period—4-8 weeks, 10-16 weeks, and 18-30 weeks. Good care is essential for a proper start and necessary for continued proper growth and overall size.

We stress to all puppy buyers the importance of feeding good dog food. Any puppy picked up here at our home goes home with a 50# bag of Black Gold Dog Food. I have fed it for over 15 years and find it to be a great feed for my dogs. Look for the Black Gold Dog Food links the information and website to the right.

I also send each puppy buyer a copy of “Proper Feeding and Exercise for your Mastiff Puppy”—a general guideline for the new owner. It covers a lot of useful information and assists new owners in the care of their puppy. It also covers some “Dos & Don’ts” relating to activities and exercise. I have placed this information in a Blog entry—look for it.

I have put together this weight chart for Mastiffs—it is based on information from several sources. Please remember it is not written in stone, but is a general guideline. This numbers are averages and different lines develop at different rates.