( CNN ) The announcement this year of a new , original Dr. Seuss book sent a wave of nostalgic giddiness across Twitter , and months before publication , the number of pre-orders for `` What Pet Should I Get ? '' continues to climb . To keep up with demand , the book 's first printing was increased from 500,000 to 1 million copies , Barbara Marcus , president and publisher of Random House Children 's Books , said in a news release Monday . `` We were absolutely overjoyed to see the response to 'What Pet Should I Get ? ' from every corner of the book world -- the bookselling community , media , educators , and readers nationwide , '' Marcus said . The publisher also released to CNN a never-before-seen image from the new volume by Dr. Seuss , aka Theodor Geisel . It features a brother and sister familiar to Seuss fans as they ogle a prim feline in a pet shop window and ponder : . `` We want a pet . We want a pet . What kind of pet . should we get ? '' When `` What Pet Should I Get ? '' debuts July 28 , it will be the first new , original Dr. Seuss book since `` Oh , the Places You 'll Go ! '' in 1990 . It features the spirited siblings from the beloved classic `` One Fish Two Fish Red Fish Blue Fish '' and is believed to have been written between 1958 and 1962 . `` Ted loved and had pets himself , as a young boy on up through adulthood , and that makes the wonderful excitement and buzz for this new book all the more special , '' said Susan Brandt , president , licensing and marketing of Dr. Seuss Enterprises . Geisel 's widow , Audrey Geisel , found the manuscript and illustrations in their California home soon after her husband died in 1991 . The materials were set aside and then rediscovered in 2013 . Random House Children 's Books said in February that it expects to release additional books from the found materials . It only seems to prove the brother and sister 's lesson from `` One Fish Two Fish Red Fish Blue Fish . '' `` From there to here , . from here to there , . funny things . are everywhere . ''
Dr. Seuss ' new book , `` What Pet Should I Get ? '' will have a first printing of 1 million copies . The publisher released a never-before-seen image from inside the book by Theodor Geisel .