Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose osteochondrosis dissecans in rottweilers [title] Check if your dog appears to have a persistent limp. [step] One of the key signs of ocd is a persistent limp or lameness in your dog. This is a common symptom in young dogs who have ocd, who may have difficulty putting some or any weight on one leg.

Ending1: [substeps] Healthy dogs that have a limp are more likely to have symptoms like this that are characteristic of ocd. [title] Determine if your dog looks strange or lethargic. Ending2: [substeps] The severity of the limp depends on how much damage develops on your dog's joint lining. Your dog may have a mild limp, where he leans to one side and puts less weight on one leg. Ending3: Your dog may also have a stiff back. [substeps] Symptoms of ocd generally end up lasting for up to 12 months. Ending4: [substeps] Dogs with ocd may appear to be lethargic, slumped over, and listless. The cause of this stiffness is unknown but may vary by dog.

Answer format: ending1/ending2/ending3/ending4