It's about nine-tenths as heavy as a Horse
In other words, 851 pounds is 0.920 times the weight of a Horse, and the weight of a Horse is 1.10 times that amount.(Equus ferus caballus) (Arabian, adult)
n Arabian riding horse (or similar breed) weighs between 930 pounds. During races, horses must carry jockeys and their equipment, which in the Kentucky Derby, for example, can weigh up to 120 pounds.
It's about nine-tenths as heavy as a Grand Piano
In other words, 851 pounds is 0.860 times the weight of a Grand Piano, and the weight of a Grand Piano is 1.20 times that amount.(for Steinway & Sons, Model D Concert Grand Piano)
A Grand Piano, of the kind used for concert performances in large music halls, weighs 990 pounds. Well-made pianos such as this may last 75 to 100 years.
It's about three-fourths as heavy as a Polar Bear
In other words, 851 pounds is 0.7480 times the weight of a Polar Bear, and the weight of a Polar Bear is 1.340 times that amount.(Ursus maritimus) (adult, male)
An adult, male polar bear weighs between 1,140 pounds. Polar bears are so heavily insulated by their 9.9 cm (3.9 in) layer of blubber that they are often difficult to detect using infrared photography sensors.
It's about three-fourths as heavy as a Grizzly Bear
In other words, 851 pounds is 0.7410 times the weight of a Grizzly Bear, and the weight of a Grizzly Bear is 1.350 times that amount.(a.k.a. brown bear, a.k.a. silver bear, Ursus arctos horribilis) (Adult, male, coastal area population average)
An adult, male grizzly bear from a coastal area (where food is plentiful) can weigh up to 1,150 pounds. In spite of their tremendous size, grizzly bears can run at speeds of up to 55 kph (34 mph).
It's about one-and-a-half times as heavy as a Pig
In other words, the weight of a Pig is 0.670 times 851 pounds.(Domestic pig, Sus scrofa domesticus, a.k.a. S. domesticus) (adult)
Domestic pigs weigh between 550 pounds. The titular character "Babe the pig" in the 1995 family film was played by 48 different American Yorkshire piglets due to the length of filming and the rate at which piglets reach adulthood.
It's about one-and-seven-tenths times as heavy as a cubic meter of Snow
In other words, the weight of a cubic meter of Snow is 0.590 times 851 pounds.(Freshly fallen, standard conditions; measurements taken in Norway, 1965-68)
One cubic meter of freshly fallen snow under standard conditions weighs an average of 510 pounds. Assembled in 2008, the world record largest snowman was constructed of 13,000,000 pounds of snow and stood 37.21 m (122.1 ft) tall.
It's about three-fifths as heavy as a Cow
In other words, 851 pounds is 0.570 times the weight of a Cow, and the weight of a Cow is 1.80 times that amount.(for Holstein, a.k.a. Holstein Friesian, a.k.a. Friesian, Bos primigenius) (adult, heifer)
A mature Holstein cow (the well-known black-and-white, spotted breed of cow) typically weighs 1,500 pounds. President William Howard Taft (1909 - 1913) kept a Holstein cow named Pauline Wayne on the White House grounds — a gift from a Wisconsin senator and the source of the First Family's milk.