You said: "We were so proud of him yesterday though, he go all defensive of a dog walking past the house and his ridge finally showed itself. He looked so cute"
Ridges in Ridgebacks are present all the time. What you refer to here is actually called "hackles", all dogs have them. You can go to www.rrcus.org to see and read about Ridgebacks, their ridges and breed behaviors.
Please do not encourage defensive behavior from your puppy, this will only cause problems that will be very hard to correct later on.
Ridgebacks by Lexess
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