Potted dendrobium dropping leaves

[Chunker37]

I have a dendrobium that is dropping most of its leaves. It's been inside all winter in a relatively dormant stage. I placed it outside last week during a rainstorm so it could get some natural watering. About two days later I noticed leaves falling off. I've lost about half the leaves that were on it prior to getting the rainwater.

Being relatively new to growing orchids and only having this one for almost a year now I am wondering if this is normal? Will new leaves take the place of the old ones? Should I remove the canes which have no leaves? I'll try to attach the photo of a bloom from last year so you can see it when it was healthy.



Any suggestions?

Thanks, Dave