You could use a hairdryer on low heat, constantly monitoring the temperature of the air on the bunny's skin by placing your hand in its path. (petsmagazine.com.sg)
Used for monitoring the temperature in the cabin where the guinea pigs live. (amazon.co.uk)
For improved driving comfort and refinement, the transmission control strategy closely monitors temperature, speed and electronic stability control activation. (greencarcongress.com)