Islamic Interpretation of Dreams (Ibn-i Sirin):

(Den; Lair; Hole; Burrow) In a dream, any hole or den of such mammals means pursuing innovations in one’s religious practices, or being attached to following leaders of such ideas and who will lead people astray.

A den in a dream also represents the element of charcoal.

If one sees an animal coming out of a hole or a den in a dream, it means that he will utter words that befit the character of such an animal.