Assuming that they have a human density (65 lb/ft^3)
And take a human of a roughly proportional size (260 lb, 5’9” or 5.75 ft)
Calculate the volume of the human:
260 lb
—————— = 4 ft^3
65 lb/ft^3
We will assume the shape of the human to be a cylinder and solve the radius:
V = h * pi * r^2
(V/(h*pi))^1/2 = r
r = 0.47
(I know this looks like a weird number, but you gotta remember that we are not taking into account empty space and round edges)
We proportionately increase both height and radius until we reach about 9 feet of height:
9 ft
——— = 1.565
5.75ft
0.47 * 1.565 = 0.736
We solve for the volume for the upscaled cylinder:
V = h * pi * r^2
V = 15.3
And then finally the weight:
15.3 * 65 = 996.7 lb
For reference, the heaviest man in the world, Jon Brower Minnoch (1941-1983), weighing in at 1400 lb, 6’1”.
Edit: There were plenty of animals which both were bipetal and weighed over 1000 pounds, but are now extinct, like the T-Rex or the elephant birds of Madagascar.
Edit2: Disclaimer: this makes the following assumptions:
-That the human and Teddi are proportionately accurate
-That the ratio among organs, fat, muscle, bone, etc. are likewise remains proportional.
-What Teddi is made of is even human proportional begin with.
Edit3: center of mass concern critique: though yes they do have a larger… *cough* chest… than normal, it’s important to consider the fact that:
1. Their legs are still FAR bigger than their chest, so if the center of mass were to raise, it wouldn’t raise that far.
& 2. The material which they are made of and the densities there of:
Air (lungs): 0.075 lb/ft^3
Fat: 57 lb/ft^3
Milk: 64 lb/ft^3
Muscle: 66 lb/ft^3
Bone: 120 lb/ft^3
So given the fact that the chest contains more of the first two and with legs the latter. The fact that center of mass would be issue, is unlikely. They just need strong back muscles, which I’m sure they’ve already developed from their “activities”.