Redness under the golden retriever’s eyelids may be caused by improper diet, internal heat, conjunctivitis, etc. First, you need to improve the dog’s diet and feed it some lighter food. Do not feed the dog high-salt or high-fat foods. You can also feed some vegetables and fruits appropriately; then clean the indoor hygiene regularly to avoid bacterial infections in dogs; if there is no improvement, you can use anti-inflammatory eye drops for auxiliary treatment.