A mysterious "
Fred Junior
" appears in some early promotional material and in the first Flintstones Golden Book, released before the show aired. Junior was dropped at the last minute, and no Flintstone child appears until the third season, when Wilma becomes the first cartoon character to experience an on-air pregnancy. The pet dinosaur, Dino, is named "
Harvey
" in early promotional work. He does not appear for several episodes, and then later, in "The Great Snorkasaurus Hunter," he is discovered for the first time. The animators also took some time deciding if he is blue or (as in most episodes) purple (or, as in that Golden Book, green). Doubtless this mattered less at a time when most people watched the show in black and white.
http://www.oocities.org/utherworld/retconbedrock.html

I had that book. Fred did not want a pet dinosaur because it ate too much but changed his mind when it saved his life. Wasn't the dinosaur named Harvey?

Yes..I sure do! THere was even a 1960 Little Golden book(Hanna-Barbera's)Flintstones, Fred Jr. Cover: Fred, Wilma, Fred Jr. and nameless "Dino",looking at the reader from the front of the book, orange background on the cover.
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