I'm assuming that the white patches are on your golden retriever's skin? This could be due to a variety of things such as allergy, irritation, dry skin, etc.

It's always best to take your dog in to see the vet when you spot changes in his/her health. Especially if you are feeling uneasy about it.

It's always best to have the peace of mind knowing it is nothing to worry about ... or knowing that you are taking care of the problem.

Best of luck!