Clodsire is a quadrupedal, amphibious Pokémon, with a rounded body that is dark brown on the top and light brown on the bottom, forming a wave pattern in the middle. It has black beady eyes, a large mouth, and a pair of tiny nostrils. Its four legs are rounded and have three digits each. A short dorsal fin delineates its lower back and ends at its stout, bulbous tail. Clodsire appears to be a relative of Quagsire.
On top of Clodsire's back are six light purple circular spots. If Clodsire is attacked, it will retaliate by sticking out large, thick, light purple spines from these spots — a dangerous and risky move. Clodsire lives in the depths of ponds and swamps, and helps Paldean Wooper cross waters by carrying them on its back.
Clodsire, its Poison typing, and its ability to extend spines out of its body all appear to be based on the Iberian ribbed newt, which is known for its ability to puncture its sharp ribs through its skin and coat them in poison as a defense mechanism. Clodsire also somewhat resembles a giant salamander and a smooth-head blobfish.
Clodsire may be a combination of clod (lump of earth), sire or Siren (a genus of salamander), and Quagsire.
Dooh may be a combination of 土 do (earth or ground), 毒 doku (poison), 王 ō (king), オオサンショウウオ ōsanshōuo (Japanese giant salamander), and ヌオー Nuoh (Quagsire).