They look pretty bad....is your vet an ortho specialist or has he suggested you see a surgeon? I know of dogs with hips just as bad who are still walking around at 12 years old without having any intervention but supplements and common sense management.
It depends on the dog and his tolerance and pain levels. Which, unfortunately, you have to guess about given he can't tell you....observe him, keep him lean, give supplements and take it day by day....
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