Young Boxer Still Limping After a Normal Drawer Test
A normal drawer test is reassuring, but it doesn't rule everything out, especially in a tense, muscular young dog. In a 10-month-old, other causes include a slipping kneecap, growth-related bone or cartilage problems such as osteochondritis dissecans or panosteitis, an injury where the bony bump below the kneecap pulls away at the growth plate, and soft tissue injuries.
Since the knee looks different from the other side, ask your vet for X-rays of both knees for comparison, or a referral to an orthopedic surgeon. Restrict running until it's sorted out.
See dog knee problems and luxating patella in dogs.
This is general information, not a diagnosis. Please follow your own vet's advice.
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