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lol! Those strange barks are sometimes hard to pinpoint the source. The one thing that seems for sure is that whatever it is he seems a little surprised and panicked if it is a high pitched bark and he is staying put- those are generally the kind that are basically calling the rest of the pack for back-up.
Could be that he has good hearing or even the opposite – that it is going and thinks he hears something but is unsure and worried by his inability to confirm what he thinks he might have saw or even felt through vibrations.
I would say the first place to troubleshoot would be health. Take a good look in his ears and if it is really a big concern have his hearing checked.
If he is just having some trouble with impulse control – I would say be sure he is eating high quality proteins and try some fish oil.
But, does sound like a tricky one that might work itself all the way up our troubleshooting model to ‘management’ where a noise maker at night might help drown out the faint sounds. I have one that makes cricket sounds, the ocean, white noise, rain, etc.
