* Infection: An infection in your dog's leg, foot, or paw could also cause him to limp. This could be a bacterial infection, such as cellulitis, or a viral infection, such as parvovirus.
* Arthritis: Arthritis is a common cause of limping in older dogs, but it can also occur in younger dogs. Arthritis is a degenerative joint disease that causes inflammation and pain in the joints.
* Hip dysplasia: Hip dysplasia is a condition in which the hip joint doesn't develop properly. This can lead to pain and limping in dogs of all ages.
* Elbow dysplasia: Elbow dysplasia is a similar condition that affects the elbow joint.
* Luxating patella: Luxating patella is a condition in which the kneecap dislocates from its normal position. This can cause pain and limping in dogs of all ages.
* Cancer: Cancer can also cause limping in dogs, although this is less common in younger dogs.
If your golden retriever is limping out of nowhere, it's important to seek veterinary attention right away. The vet will be able to diagnose the cause of the limping and recommend the best treatment.