Illustration I:
The expectations from heterozygous bob-tail x normal tail crosses. Half the puppies should have bob-tails and half will have normal tails. Half-shaded boxes indicate the bob-tail heterozygotes (Bob/+) and the open boxes those with the normal long tail (+/+).

Illustration II:
The expectations from intercrosses of bob-tail heterozygotes. 75 percent of the progeny should have bob-tails - if the homozygotes are born and resemble the heterozygotes; the homozygote should comprise 33 percent, or 1/3, of those puppies with bob-tails. The bob-tail homozygotes (Bob/Bob) are indicated by fully-shaded boxes.

Illustration III:
The expectations from homozygous bob-tail x normal tail crosses. All the puppies should have bob-tails.