Just attempting to wrap this up.  We were able clone/snap a copy of the db over to another environment and run a dbcc check there successfully.  however, we had to...

Putting this on this thread as well:  Thanks Sue, I was just making sure the thread was still be monitored. So we have 3.8 tb mount points with 60% free...

I have a similar issue but not related to AGs.  We're on a solid state NetApp platform with plenty of space (or so it appears).  My dbcc check will run...

Thanks Jeff!