Read the source, too.
These sources support particular explanations. They did not review or endorse this website. Published breed-standard ideals are not measured population distributions or individual health targets.
Royal Kennel Club / Irish Wolfhound standard
Primary breed standard, updated August 1, 2025. Minimum height and weight; separate desired male average. Not a population measurement or individual target.
Royal Kennel Club / Great Dane standard
Primary breed standard, updated August 1, 2025. Minimum height and weight for adults over eighteen months. Not a puppy prediction.
Royal Kennel Club / Newfoundland standard
Primary breed standard, updated April 1, 2025. Average shoulder height and average weight wording. Published unit pairs retained as printed.
Royal Kennel Club / Mastiff standard
Primary breed standard, updated December 2024. Qualitative size, proportion and soundness wording; no numeric overall height or weight in the fetched standard.
American Kennel Club / Giant-breed care
Trainer-authored care planning article, updated August 21, 2026. Training, care providers, travel, belongings and vehicle questions. Not an individual care plan.
Blue Cross / Choosing the right dog
Welfare guidance on time, cost, safe housing, individual history and rescue support. UK legal details and a general lifespan statement are not adopted as universal rules.
PetMD / Biggest dog breeds
Independent explanatory overview, updated August 16, 2023, reviewed by Jennifer Coates, DVM. It reviewed that article, not this site. List entries are not a single comparable global ranking.