Lame in hind legs - bilateral hindlimb lameness

9 month old dog Rottweiler  - young dog, large breed (developmental)

awkward gait a few weeks ago  - persistent recent problem

right leg worse than left 

worse after non-use for long periods of time and exercise

didn't respond to Rimadyl (only gave Rimadyl when painful - used as treatment)

 no trauma (no traumatic etiology)

flea and heartworm treatment

usually walked on leash - indoor dog (decreases risk of unknown trauma)

disproportionate amount of weight on forelegs (compensatory)

grade 1/4 lameness

no muscle pain or atrophy

no long bone fractures (no traumatic injury)

no neurological deficits

normal hock and stifle (tibial-tarsal joint and femoral-tibial joint intact)

no cranial drawer sign - cruciate ligament intact

no joint effusion - limits range of motion

hip joints painful - more on right and extension (localization on coxofemoral joint)

hip ROM reduced to 100 degress

Ortelani sign positive on left hip