They have a nervous system and DO feel pain, afaik the extent of pain they feel is not really known. A vet had to amputate a limb of an Axolotl I keep as a pet

They have a nervous system and DO feel pain, afaik the extent of pain they feel is not really known. A vet had to amputate a limb of an Axolotl I keep as a pet because he got into a fight with another one and he did not even finch.