Maybe medical, but maybe there was something on the roof.
Every time I think Hans barked for no reason, I discover that he was right
But perhaps she senses a squirrel on the roof or a neighbor's dog going for a walk. Frodo will bark when the neighbors dog is let out ( they are fence rivals) or if his buddy ( an old beagle) is going for a walk even though he may be lying far back from the door. Now that spring is here he will run to the door barking and whine to be let out if there's squirrels in the yard. He actually gets aroused instantly just on sensing them.
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That's the weird thing - she is normally not a growler. If she hears one of her many arch-enemy-dogs either inside or outside, she will run to the front door; if they are close, once she gets to the front door she will bark. Even that happens pretty rarely though; we've arranged our apartment (wall hangings & carpets) to stifle noise. But no growling. She reserves growling for when strangers enter the apartment, and even then it's the growl that morphs into a bark, you know? Like, grrr-bark-bark-bark-bark, catch breath, grr-bark-bark-bark, style.
Keep a log.
When something out of the ordinary starts with a middle aged dog, it could be an indication of something going on internally. She can hear sounds you may not like a siren that is a little too far off for your ears to catch.
Certainly will do. She never growls for sirens, either - not much of a growler in general; it usually takes something. As an example, the last time I heard her growl even close to this much was when one night she decided not to sleep right next to the bed, and instead slept in front of the toilet - my husband went to the bathroom at like 2am and didn't turn on the lights, didn't see her, and walked right into her. Even then, it was a quick, maybe 10 second growl.
I'm just starting to worry - we've always had some concerns about her neurologically (when we first got her she circled constantly, only in one direction; she still only circles in that direction when she potties, etc., and she's always trembled ever so slightly 24/7); she just had so many health issues last year that we couldn't afford to test for anything else (rescue did not disclose that she had EPI, so we had to test for everything; we were told she was spayed, she was not; she came to us with mastitis and an ear infection that progressed into a hematoma requiring surgery, etc etc). :X
I'll update this thread with any info I get.