Is he sick?

Mr- Fitzwilliam- Darcy

Barked: Thu Dec 29, '11 2:08pm PST 
I just started on here today. I have a 3 year old basset that we only got a couple of months ago. Last night he peed in my bed, which is really weird for him. He hasn't done that in the house before. Plus, he lies our bedroom and always puts his favorite toys on our bed to keep them away from our daughter. Today, he is really quiet and either cuddles with me or stays totally by himself. Usually is is very active and social.
Does anyone have any insite? I really am new to this whole dog life and am not sure. Thank you!-Aimee