So OK.... new dog having issues experience for us.
One of our two (Sugar), who has always already been the more chill and laid back of the dogs had an odd episode. She'd been seeming a tiny bit lethargic, which isn't super abnormal or anything. Then a few Sunday's ago they were laying in the living room just before we started watching some football. I'm walking in from the other room and I hear the wife scream panicked.
Sugar had gotten up to go somewhere took like one step and her whole body basically barrel rolled onto the ground and she couldn't get up. Needless to say panic ensued. I honestly thought she'd had a dog stroke or something. They're "middle aged" (around 10). We had to carry her since she was suddenly super disoriented and couldn't stand on her on. Throw her in the car and off for a Sunday emergency vet visit. They had to bring out a cart and roll her in.
Get there, I'm half thinking "This is going to suck and we're about to go home with fewer dogs than we left the house with". My wife is taking it even worse. Doc comes out after a bit. Turns out our dog had an episode of something called "old dog disease", aka Canine peripheral vestibular disease. It's like a part of the brain attached to the dogs inner ears (and ergo balance/etc) just desyncs and breaks. Turns out this is apparently not that uncommon (her regular vet this week on a follow up said she'd treated over 100 dogs who had it, and ours was actually a milder case). We get sent home with her more stable, but still not really wanting to try to walk on her own. With anti-nausea/anti-vertigo pills. Now three weeks later, she's back up and around, but still obviously only at around 75% balance I'd say. Still not eating as much as she did before, and now her head apparently has a permanent tilt to the right (which the docs said is probably permanent). And now she's developed a new heightened level to which she simply always wants to be near a human. She'll come into my office now to basically sit under my desk and lean up against my leg while I work. It's slowly improving but they say she'll probably never be back to 100% on agility/balance. And apparently the only cause/explanation is "This just happens to some dogs when they get a little older" and apparently her case was on the milder end.
Kinda just rambling this to share the experience, only notable take away would be. If you see your dog do it, don't panic. Get them to a vet, let the vet do their job. Vet at the emergency vet place was great about all this and especially about calming a certain Mrs Haus' nerves.