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I would be inclined to say you would want to start with a small area. Hopefully the dog's sense of smell is intact, would be its best navigator. You also might try a quiet music source like a baby's mobile or something for where "home base" is.... but yeah, it's gonna bump into things regardless. Even a dog that has gone blind in an old environment bumps into things. The dog will learn to slow down, but with something the size of a chow, you''ll definitely want to secure loose items on furniture he could path to :)