our lab is 13... she has what we think is vestibular (aka dog vertigo), she gets these about 4x per year the last 2-3 years.
Symptoms are like she's having a stroke and similar to what you described.
We did blood work, every came back fine.
We've been riding it out and making her as comfortable as possible when these happen... recovery after each seizure takes a bit longer 3-4 days, but she does recover.
Good luck with your beagle.
