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Leading the matches for Leonberger is Landseer, thanks to the same family, the same group, plus the same size class. It stands 25 to 32 inches tall, weighs 90 to 170 pounds, and lives 7 to 9 years. Completing the top three are Neapolitan Mastiff and Newfoundland, close contenders with somewhat larger differences from the first pick.
Below, every match gets its own short reading: the overlap first, then the difference that matters most.
On the numbers held for both breeds, the Landseer lands nearest to the Leonberger. Each is filed with the working and guardian breeds and classed in the Working group. Both stand in the giant class, 26 to 31 inches next to 25 to 32 inches. Weights nearly overlap as well, 110 to 150 lb against 90 to 170 lb. The contrast is gentle, mostly a matter of slightly wider or narrower ranges.
Go deeper: the Landseer profile or breeds similar to the Landseer.
The Neapolitan Mastiff follows immediately after the top match. Both records read the same way: working and guardian breeds at family level, Working at group level. Height barely divides them, 24 to 31 inches against 25 to 32 inches; both are giant dogs. Weight tells the same story, 110 to 150 lb next to 90 to 170 lb. The pace of life differs on paper, energy 3 of 5 for the Neapolitan Mastiff next to 5 of 5.
Go deeper: the Neapolitan Mastiff profile or breeds similar to the Neapolitan Mastiff.
The Newfoundland also scores near the top of the list. Size nearly matches, both giant: 25 to 29 inches against 25 to 32 inches. The contrast is gentle, mostly a matter of slightly wider or narrower ranges.
Go deeper: the Newfoundland profile or breeds similar to the Newfoundland.
The Broholmer belongs in this company on the strength of its record. Both stand in the giant class, 28 to 30 inches next to 25 to 32 inches. Activity levels split them, 3 of 5 versus 5 of 5 in the trait records.
Go deeper: the Broholmer profile or breeds similar to the Broholmer.
The Bullmastiff rounds out the closest matches. On size they are hard to separate: both giant, 24 to 27 inches and 25 to 32 inches. One contrast is energy, scored 3 of 5 against 5 of 5.
Go deeper: the Bullmastiff profile or breeds similar to the Bullmastiff.
The St. Bernard rounds out the closest matches. On size they are hard to separate: both giant, 26 to 35 inches and 25 to 32 inches. Little separates them beyond small shifts in the numbers already noted.
Go deeper: the St. Bernard profile or breeds similar to the St. Bernard.
Scoring keeps the Greater Swiss Mountain Dog close to the Leonberger as well. On size they are hard to separate: both giant, 23 to 29 inches and 25 to 32 inches. Little separates them beyond small shifts in the numbers already noted.
Go deeper: the Greater Swiss Mountain Dog profile or breeds similar to the Greater Swiss Mountain Dog.
Also high in the comparison is the English Mastiff. Both stand in the giant class, 27 to 32 inches next to 25 to 32 inches. Energy is a divider in the records: the English Mastiff scores 3 of 5 against 5 for the Leonberger.
Go deeper: the English Mastiff profile or breeds similar to the English Mastiff.
| Breed | Size | Height | Weight | Lifespan | Family |
|---|---|---|---|---|---|
| Leonberger | Giant | 25 to 32 in | 90 to 170 lb | 7 to 9 yrs | Working and guardian breeds |
| Landseer | Giant | 26 to 31 in | 110 to 150 lb | 8 to 10 yrs | Working and guardian breeds |
| Neapolitan Mastiff | Giant | 24 to 31 in | 110 to 150 lb | 7 to 10 yrs | Working and guardian breeds |
| Newfoundland | Giant | 25 to 29 in | 100 to 150 lb | 8 to 10 yrs | Working and guardian breeds |
| Broholmer | Giant | 28 to 30 in | 88 to 154 lb | 7 to 10 yrs | Working and guardian breeds |
| Bullmastiff | Giant | 24 to 27 in | 100 to 130 lb | 7 to 9 yrs | Working and guardian breeds |
| St. Bernard | Giant | 26 to 35 in | 120 to 180 lb | 8 to 10 yrs | Working and guardian breeds |
| Greater Swiss Mountain Dog | Giant | 23 to 29 in | 85 to 140 lb | 8 to 11 yrs | Working and guardian breeds |
| English Mastiff | Giant | 27 to 32 in | 120 to 230 lb | 6 to 10 yrs | Working and guardian breeds |
By lifespan, the picks cluster fairly tightly around Leonberger, whose own range is 7 to 9 years, with only modest differences separating the top names in this set.
The Landseer is the closest match this comparison finds, carried by a shared family, the same group, a matching size class and a close lifespan.
Much the same size in the records: the Broholmer stands 28 to 30 inches and weighs 88 to 154 lb, the Leonberger 25 to 32 inches and 90 to 170 lb.
On the recorded ranges the Greater Swiss Mountain Dog lives longest of the matches, 8 to 11 years against the Leonberger at 7 to 9 years.