. "omparable size, and are compatible, may be transported in the same primary enclosure. (2) Puppies or kittens 4 months of age or less may not be transported in the same primary enclosure with adult dogs or cats other than their dams. (3) Dogs or cats that are overly aggressive or exhibit a vicious disposition must be transported individually in a primary enclosure. (4) Any female dog or cat in heat" . . .