Are dogs the worst pet of all time?

That's like saying Brock Lesnar isn't massive, because Brock is 6'3 and 286 lbs, while the Big Show was 7'0 and 485 lbs.

For a dog - an animal that is usually around 50 or 60 lbs for a "medium" breed, and with many of the most popular non-working breeds being less than half that size - 100 lbs is quite massive.
Brock Lesnar isn't massive he's just kinda big.