Buy a bag of spaghnum moss, soak it, wring it out and place it in the hide. You may need to provide a larger hide to accommodate both the moss and your animal.
This creates a humid hide. I keep several species of snake that require high humidity. The ambient in the snake house is about 35 to 40%. I provide humid hides, humid retreats and humid nest boxes and have no issues whatsoever.
im going to listen this time and not be a douche, but where can i get this moss?
Reptiles
0.0.1 - Rhacodactylus Ciliatus, Cheerio
Mammals
1.1 - Canis Lupus Familiaris, Little Man & Molly