Dog sized bugs

Rememer Robert wadlow?   Wadlow reached 8 ft 11.1 in (2.72 m)[2][3][4] in height and weighed 439 lb (199 kg) at his death at age 22. His great size and his continued growth in adulthood were due to hyperplasia of his pituitary gland, which results in an abnormally high level of human growth hormone.   But what if that happens to an animal? King kong? It is possible!   imagine a spider on 2kg! that will be sight for life. Or a cow on 5 tons! Meat to all   my garage is clear I just need to buy the stuff i need to do the mission!