My son has a rose hair tarantula. We have had it for about 1 1/2 yrs. It has never molted. In the last few weeks it has stopped eating and hardly moves. It looks like it's just lying down with its legs spread out. Even when touched it only moves slightly. We recently changed it's dirt and after doing some research tonight, took the wet sponge out and gave it a water bowl. My son is heartbroken because he's afraid it is dying. What's going on?