Gerbils and turtles and ""Gallons of Guppies""; a guinea pig who demonstrates that the new arrival won't displace first-born Dick; ""The Dog Who Came to Dinner,"" the kitten who disappeared (""Where's Willie?""), an ugly pooch pining for a playmate (""Muggsy""), a smelly problem--""Twenty-four Cakes of Flea Soap""--with a fitting solution. Those in the first group demonstrate how-to-keep-pets without sounding didactic, the starting pair (both originals) being set in and suited to a city apartment; most of the others plot the peccadillos of dogs and cats and could happen anywhere, while the problems of disconsolate Dick and overstocked Billy (from Betsey and the Boys) are their problems, the animals acting as catalysts. Kids won't of course make these distinctions; if the stories aren't all city-limited, they're not country-shaded, and all of the ten set a fast pace at a second/third grade level. Michael Hampshire's personable drawings (which feature many black faces) are a fine Come-on and follow-through.