I adopted a rescue golden at 11 months. He had no interest in retrieving...he liked to go one way and have you chase him. What worked for me:
1. Find treats the dog really likes (for a Golden almost anything).
2. Practice coming when called and reward as appropriate.
3. For retrieving, start with small distances, really just a step or 2
3. Toss the ball or dummy or whatever. Once the dog gets it, immediately have him drop it, reward with treat, praise, etc.
4. Continue, increasing the distance.
You're rewarding three separate behaviors: Picking up the object. Releasing it. Coming when called. You might need to break it down into separate exercises to build muscle memory. DO NOT chase the dog to get it back. That's a fun game and just patterns the wrong behavior. Eventually turn your back, be disinterested, etc.
My pup is now 10, and, after a series of illnesses, very close to the end of his life. I cannot begin to convey how much he's brought to my life and the life of my family.
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