My 10 yr old foster dog,Pearl,also did not respond to the fireworks.She perked up once and then that was it.When Pearl first came to me,I thought she was deaf as she did not respond to a thing.But I do know she can hear things,just has selective hearing.
I really do not think there is anything to worry about with Coco.He is not fully deaf and maybe he just calmed down with age when it comes to the fireworks.He could care less now.
You will know when he is deaf (if he does lose his hearing),as he will not respond to sounds or voices.
* Lisa *
* To the world you are ONE person,but to a rat you are the world *
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* It's a rat thing...you wouldn't understand! *