Dogs and pups in the following situations are exempt from exercise requirements:
(They don't have to be given/allowed exercise or out-of-cage time.)
» Puppies under 12 weeks old. Puppies can and often do live the first critical weeks of their lives in the same cage or kennel.
» Dogs housed alone and given at least twice the minimum housing space. At twice the space required, dogs still can't run, let alone walk more than a few steps. Breeding dogs may legally spend their entire lives in cages this size.
» Dogs housed in groups. If dogs live in the same cage or kennel and there is enough room so that each could have her own required floor space, it can be really crowded, and they are all exempt from exercise.
Link to full Animal Welfare Act
Housing requirements start on page 61.
Exercise requirements start on page 63.