Actually both have yellow legs, check the Standard. Beyond the comb, size & type are different. They look alike to people who don't really understand breed characteristics because both have similar, but not identical, coloring. If you actually know the Standards for both breeds they look quite...
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If he's bigger than most Barred Rocks & is Barred not Cuckoo he does NOT have great conformity as to what the breed should be. Dominiques should be Cuckoo & smaller than Rocks.