HI
Sorry to hear about your news, i'm not sure if your dog has been scored ?.
Anyway we have a leonberger , who was always sitting funny and had a slight turn in her back leg.We were worried about this so spoke to our vets & to cut a very long story short they straight away advised us to spay her whilst they were checking her hips ( they said they were sure it was hd ).
We said no , xray her and we will go from there..... the xrays were done we were called back to view them dreading the worse only to find nothing was visable , they were then sent off to a specialist for thier opinion.
This came back as mild hd , but the specialist continued to say that any dog who's hips do not come back 0-0 , has mild hd even champions
Our girl goes swimming every couple of weeks & they build the amount on lengths she does little by little , also every six months she goes to a chiropractor , just to keep a check on her
Hope all goes well for you .