The dog keeps sort of tracking something under the deck at night. Always about this time of night...she sniffs the boards and then appears to be following "something" around as it moves about beneath....I can't see under it or access it really....there's a bit of a gap at the sides but you can't peer under or anything.
I can't stand the thought of setting traps....would it be mice do you think? Or something....bigger? 
I can't be calling out any exterminators to check...they;ll kill things...what if anything should I do? The deck leads directly off my French windows into the sitting room...we sometimes leave bin bags of rubbish there when the outside bin is full...not for long...about a day or two at most...could this have brought meeces?