Hips Strengthening for older Doberman

I have a now 12 year Doberman that is starting to show signs of a bit of hip discomfort and muscle loss. He takes Dasiquin, but am curious if there are any other supplements, regimens or treatments that you all have found helpful to strengthen your older Doberman’s hips. Appreciate any recommendations. Also welcome any tips for aging Dobermans in general! We are very lucky!