We have three minpins that are so high strung that they make Barney Fife seem as mellow as Perry Como. This pack of dogs bark when the leaves rustle, and are very territorial. Nothing misses their watchful eyes. They live in our large back yard and thrive there.
The other night at about 3 a.m., the pins began barking; all three of them at once. Nothing new there, but the timbre of their bark was different; lower and more ominous.