Males normally weigh 65–80 kg (143–176 lb), and females 55–65 kg (121–143 lb), placing them in the 'Giant' weight range; but some Newfoundland dogs have been known to weigh over 90 kg (200 lb) – and the largest on record weighed 120 kg (260 lb) and measured over 1.8 m (6 ft) from nose to tail, ranking it among the largest of dog breeds. Males normally weigh 65–80 kg (143–176 lb), and females 55–65 kg (121–143 lb), placing them in the 'Giant' weight range; but some Newfoundland dogs have been known to weigh over 90 kg (200 lb) – and the largest on record weighed 120 kg (260 lb) and measured over 1.8 m (6 ft) from nose to tail, ranking it among the largest of dog breeds. The smaller breed was known as the Lesser Newfoundland, or St. John's dog. The St. John's dog became the founding breed of the modern retrievers.