Oh Ginger and Bernie Izzy is obsessed just like you. We found out we have a family of chipmunks living under our deck.

Izzy knows that they are there and it's been crazy for over a year now. We have to put this wire fence around our deck so she doesn't squeeze under it to get them.

The brown wire fence my husband got at Home Depot and then I planted these nice small, miniture grasses around the deck to hide the wire fence. So far..knock on wood that she hasn't started to dig for them.
OK fast forward to this year...we also have an opening under our kitchen addition that hangs over the foundation. We never had a problem but this year OMG we saw a skunk go under there. Izzy would bark like crazy during the day at her (she could see under that little opening where she wa sleeping

) so we have to fix that issue this weekend with decorative bricking and again planting with taller grasses to hide that. I didn't mind the chipmunks but oh my didn't want Izzy to get sprayed by the skunk. Skunk has not returned!!!
It's a never ending situation but hey our Yorkies are terriers and ratters that are trained to hunt out small critters.

Oh and we have two families of squirrels living in each neighbor's tree (one Oak and one Buckeye tree). So needless to say Izzy is patrolling our yard 24/7. I'm surprised that our neighbors haven't said anything yet about her constant barking..hahaha!