Advice for stressed or depressed chinchilla

I’m a new chinchilla mom, I got a 9 month old chinchilla named kuro
He’s a happy go lucky brat but as of yesterday he’s been acting strange he’s not as playful, bites pretty hard, when he’s on my bed he hides instead of running around or escaping by bed to go under my bed and when he did go under my bed he’s barking..I recently bought in a dog who’s owner couldn’t take care of him anymore (or at all for the matter) and it was very unexpected..unfortunately again my new dog has to sleep in my room because my other old dog isn’t used to him yet..if anyone has any advice on how to calm that stress or it’s a vet situation please let me know
He’s my baby and it’s starting to stress me out too