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Hi there, you are through to Dr Linda. Just a few moments as I type my response
I'm sorry to hear Chaz has this issue.
At this stage, it would be wise to have a general health check (quick look over from head to toe looking for e.g. a rotten tooth, sore joints or enlarged prostate) as discomfort or a chronic health issue may be behind this behaviour change. A basic blood test looking at liver/kidney function is also wise for this reason, as is a urine screen to look for e.g. a grumbling cystitis.
If his health is found to be good, he may be showing the symptoms of canine dementia. This is a relatively common disease in older dogs and symptoms can include barking, pacing, staring into space etc Many owners find signs are worse at night for some reason. Though there is no cure, it can be an idea to have these dogs on brain supplements and a special diet. Here is some more info: https://thebark.com/content/canine-dementia-signs-symptoms-treatments
Another consideration would be generalised anxiety which perhaps has worsened with the recent fireworks and bad weather. We would thus consider having a vet behaviourist coming to the home to assess him. It would be a good idea to have an Adaptil diffuser and to trial a course of calming supplements e.g. Zylkene to see if these help.
Ah, you are way ahead of me in that regard!
If the diffuser has not helped, consider an Adaptil collar as these can work better in some.
Please do feel free to keep me updated on the vet visit and to ask any further questions you may have.