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Hello. Thanks for the question.
His signs do sound like they are neurologic. This could be one of a couple things. Partial seizures is one, and the most likely cause would be a brain tumor (meningioma). We often see strange neurologic signs that are slowly progressing over weeks to months. We can also see behavior changes (growling) and accidents in the house.
The other thing would be canine cognitive dysfunction. This is basically like dementia in people. It's also slowly progressive without a known cause.
The only way to know for sure, is to get an MRI of the head. This is an option, but it does get pretty costly. There is a medication called Anipryl that can help with the signs to slow them down. Bloodwork wouldn't hurt to rule out low blood sugar from something like an insulinoma. I think that is less likely though.
Here is some info on meningiomas in dogs:
I hope this helps, let me know if you have any other questions