Bloat or Gastric Tortion is the number one silent killer of deep chested breeds, including German Shepherds of any age. Familarize yourself with the symptoms of bloat.
Kennel Cough or Bordetella Information. Watch for loss of appetite and lethargy. Your dog will usually recover on its own, but if these symptoms develop, see a vet right away!
Panosteitis. Is your young dog limping but there is no apparent injury? Read about a common conidtion in young German Shepherds.