According to Bulbastupidia
Cyndaquil turned from a hedgehog to a rat in 2 steps
Originally Posted by Bulbapedia
The appearance of [Typhlosion] is mainly based on the honey badger. It may also seem reminiscent of mustelids and wolverines. It has a long and agile body, like weasels, though it is significantly larger and thicker than its pre-evolutions.