I had answered one of your other threads. I'd also be very concerned that it's both legs. It is "possible", but not absolutely certain that this isn't her legs at all, but a neurological issue.
Because the pup isn't in front of us, I don't think anybody here can say for sure. But I do think that an immediate (by immediate I mean right now) visit to a vet that will look farther into this is warranted. With neuro issues, depending on origin, waiting can mean the difference between full recovery and not recovering at all. While so many things could make back legs start to give out, my major immediate concern is a spinal problem.
So, I'd say go straight to a vet that will take this very seriously just in case.
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