Lizard
The lizard, like the snake, is a reptile and shares its symbolic traits related to basic instincts. We also refer to the "reptilian brain," which is considered to be entirely devoid of nuance; fight-flight, hunger-eat, and so on.
There is an almost endless variety of lizards. In a dream, it can be significant whether it is large or small, colorful or colorless, poisonous or not, and so on.
The lizard has some relation to the dragon, but with the crucial difference that dragons can be considered conscious.