The size scales assigned to creatures make a lot more sense on an exponential scale. Squirrels have a size of 0.15; 80kg * 0.15 = 12kg, so ridiculously large squirrels, while 80kg0.15 = 1.93kg, which is much closer to a reasonable value. The other direction doesn't work out quite as well (size 4 elephants should only be around 5,000kg rather than 40 million kilograms) - but in the real world Elephants weigh about twice as much as Rhinoceroses, which are size 3, so it's clearly not a linear scale.
But for huskies and labradors specifically, that's irrelevant. They're exactly the same size as adult humans, so whether the scale is linear, exponential, logarithmic, or whatever is irrelevant. Other animals with a size of 1.0 include Alpacas (real world average weight: 60-85kg) and Wargs. Clearly, substantially larger creatures than your average wolf.
But for huskies and labradors specifically, that's irrelevant. They're exactly the same size as adult humans, so whether the scale is linear, exponential, logarithmic, or whatever is irrelevant. Other animals with a size of 1.0 include Alpacas (real world average weight: 60-85kg) and Wargs. Clearly, substantially larger creatures than your average wolf.

