A big birthday for a really big dog. Clifford the big red dog turns 50. That's right, 50 years of antics and adventures with Clifford, Emily Elizabeth, and the rest of the gang. Scholastic has a "big" birthday app where children can help Emily Elizabeth decorate the doghouse, then call Clifford in for his birthday surprise. To view the app, log on to www.scholastic.com/app/clifford/birthday  for a code to get the app for free.