The 10 heaviest dog breeds

This ranking orders breeds by the midpoint of their typical adult weight range (a breed weighing 50–70 kg counts as 60 kg). When two breeds tie, the one with the higher average height comes first, then alphabetical order. These are breed ranges: individual dogs, and males compared with females, can differ widely.

No. 1 — Mastiffabout 85 kg on average (70–100 kg)One of the heaviest dogs in the world, the Mastiff is a calm, dignified giant that is very gentle with its family.
No. 2 — Spanish Mastiffabout 80 kg on average (60–100 kg)A calm giant from the Spanish plateau, the Spanish Mastiff is a noble, serene flock guardian that is gentle with its family.
No. 3 — Saint Bernardabout 75 kg on average (60–90 kg)The legendary rescue dog of the Alps, the Saint Bernard is a gentle, patient giant built for cold far more than heat.
No. 4 — Boerboelabout 72.5 kg on average (55–90 kg)A large, heat-hardy South African mastiff, the Boerboel is a powerful, calm farm guardian that is very protective of its family.
No. 5 — Great Daneabout 70 kg on average (50–90 kg)An elegant giant with a gentle nature, the Great Dane is a calm, affectionate companion, but its size demands suitable space and budget.
No. 6 — Caucasian Shepherd Dogabout 62.5 kg on average (45–80 kg)A massive guardian with a thick coat, the Caucasian Shepherd is utterly loyal to its family and formidable towards intruders.
No. 7 — Newfoundlandabout 61 kg on average (54–68 kg)A soft-hearted giant and outstanding swimmer, the Newfoundland is a legendarily gentle family dog, but very sensitive to heat.
No. 8 — Leonbergerabout 60 kg on average (45–75 kg)A gentle giant with a lion-like mane, the Leonberger is a calm, patient and very sociable family dog, but poorly suited to heat.
No. 9 — Central Asian Shepherd Dogabout 60 kg on average (40–80 kg)An ancient livestock guardian of the steppes, the Central Asian Shepherd is powerful, independent and highly protective, for experienced owners only.
No. 10 — Neapolitan Mastiffabout 60 kg on average (50–70 kg)Massive and covered in folds, the Neapolitan Mastiff is an impressive, calm and loyal guardian whose health needs close attention.