You need to be careful with every breed, do some homework and assess the parents and get all the checks you can. It's bad enough having health issues with any pet, it's really bad when you've just got a dog with "problems" from the get-go. Very upsetting.
Yeah, I imagine it's sad. Especially cause they're so cute

But yeah, I'd definitely research and do testing on any breed, just the random rage thing kind of scares me. You don't know what dog is gonna have it. And like at least with hips or another health issue you can maybe try to treat it but you can't do that with a neurological thing