Eeek! A snake

The dogs were barking like crazy this afternoon, so I walked outside to see what was going on. Lucy is on her front paws just barking and barking at this little guy.

It did occur to me AFTER I took a quick photo and brought the dogs inside that perhaps leaving it in the backyard without knowing what it was, let alone whether it is poisonous, might not have been the smartest thing I've ever done. And, of course, I cannot find it, now.