This book is 2nd in the series of The Two Wiener Dogs books. This edition, the Two Wiener Dogs learn to add and subtract by counting many things while on a walk. We learn to count things every day, and the many friends that they meet as well as the things they encounter. We can all learn to see a hyphen between the numbers and know that we can say them outloud. The Two Wieners have fun counting and so can you!