Knighterrant Mastiffs - Gentle Giants

About Us


Welcome to our new website. ​

  ​​We started with our first Mastiff, as a pet, in 1988 and have never looked back. We fell in love with Tiny who turned out to be the best in her litter, a true gentle giant. So we showed her to her championship, had her hips and eyes and elbows certified and bred her in 1992. We have been showing, breeding and placing Mastiffs ever since. 


Happy, Healthy Championship Bloodlines

Breeder of 25 litters of English Mastiff Puppies in the past 27 years from this line and breeding to the following Champions:  Ch. Grenier Hall  Jedadiah, Ch. Acorn Hills Silent Knight,  Ch. Baskerville's Magnus Augustus, Ch. Baskerville's Prince Lothar, Ch. Knighterrant's Heavy Duty, Ch. Therecco's Dragon Knighterrant, Ch. Knighterrant Sherman the Tank, Ch. NorthernPaws OscarKnighterrant, to name a few.

Ch. NorthernPaws OscarKnighterrant "Baxter"

A Forever Friend

 All our breeding stock is tested for OFA hips, elbows, eyes, and PennHip, PRA, DM, CMR1, Cystinuria, and the long haired gene.  We belong to the  CKC, MCOA,  Canadian Mastiff Club, and OKC .               Only the clear and best dogs are bred.

Sign Up For Updates

Site Content

Mastiff Info


  • Our Breeding Plan page is where you will find our plans for upcoming litters. 
  • Who will be bred and when puppies are expected.
  • We have a copy or our contract, deposit and purchase agreements and Questionnaire on the bottom of this page. 
  • A Current Litter page is displayed if we have puppies available. 
  • Prior Litters are listed here.

Our Dogs

We have a separate pages for:

Show News

  • We attend many local dog shows from the Ottawa area to as far as Kingston.
  • Visit our Show News page for a listing of our shows we will be attending as well as our Show Results,  photos and brags.


Our Links page includes:

  • Important links  regarding health testing, 
  • Clubs we belong to for the Mastiffs,  
  • Reputable breeders
  •  and more. 

Contact Us

Thank you for visiting our website. Our goal as a reputable breeder is to provide you with information about the English Mastiff and English Mastiff puppies,  when we are breeding, and to give you the important links we think you should know about. If you have any questions or comments about our dogs, our website, you need more information or you want to inquire about puppies then we want to hear from you. Please use the method of your choice below to contact us

We have a Frequently Asked Questions page for your reference. If you cannot find the information you are looking for, please contact us with your questions or comments.

Knighterrant Mastiffs

2661 Stagecoach Road Osgoode, ON K0A 2W0 Canada

(613) 821-6279

Inquiries always welcome