A dog in a shelter has lost its people. Despite its high trainability and people-orientation, a Golden Retriever needs time to build trust in its new home. Some dogs show separation stress at first, insecurity in everyday situations or gaps in leash training because they lacked clear structure in their previous home.
Health is a particularly important point. Golden Retrievers are considered robust but show a clear pattern: joints, eyes, skin changes and a breed-typical tendency toward cancers such as hemangiosarcoma, lymphoma or mast cell tumors often remain issues for life. A health-focused breeder has the parents examined before breeding – hip and elbow dysplasia by X-ray, eye diseases such as cataracts and retinal dysplasia clinically, and the heart for aortic stenosis – uses established DNA tests for skin health and for breed-specific eye conditions such as progressive retinal atrophy 1 and 2 (GR-PRA1, GR-PRA2), and knows the ancestors' lifespans in detail to lower the risk of cancer and hereditary diseases in the line. With a shelter dog, though, the genetic background is often unknown. If the dog originally comes from a puppy mill, these important screenings of the parents are missing entirely.
So be prepared for issues such as atopic dermatitis, an underactive thyroid or ear and eye problems (such as ectropion or entropion) to come up over the course of a 10- to 12-year life. With consistent weight management for the joints, good skin care and regular checks for lumps by feel, you'll make a crucial contribution to prevention yourself.