just blow some smoke into the area which that rat is. I have 2 rats currently (Misty and Snowdrop) and I used to have another (Hazy, short for purple haze because I died it purple, and dont worry I made sure the dye would not harm the rat b4 i died it) Anyway I get my rats high all the time and they love it, it also really calms them down and they will become very content and playful...long story short it should come out and may let you catch it!