Huh

I've been in Boxers 16 years plus now and all the dogs that I've owned or had the pleasure of
knowing have never had problems with back legs going.
Yes they have problems as a breed with Cancer, some heart conditions, thyroid, some
have skin complaints, allergies etc.
Used to have GSD's (English type) in the family and yes we had problems with those with back legs
when elderly.
Think those people don't know what they are talking about personally!