Ehhhh, I walk my 6 month old husky no fewer than 5 miles/day and sometimes he even comes with Danika and I for our entire 20 miles if he doesn't seem ready for me to drop him back at the house yet. His vet doesn't raise issue with it, and doesn't seem to have any joint pain or anything (and I give him a massage every night after I've brushed him). I say take her out for a few miles, make sure your vet is aware and take her for a "just because" check up in a couple weeks or so.