Marion Nestle and Malden C. Nesheim, authors of the new book Feed Your Pet Right , said that organic petfood is largely a marketing term that isn't verified and also claimed that premium petfoods contain mostly the same stuff as basic supermarket brands, according to a  book blog .

Nestle, a public health professor and author of other books, said the labels are confusing and the organic label is a misnomer.

Neither provided specific information to support their claims.