This is a great book and I have just heard from the author - Wolfgang Schad - that a new translation of the enlarged 2 volume book will be available before long. That's great.
"Finally a new edition, grown to two volumes, has now been published in German: Säugetiere und Mensch" Verlag Freies Geistesleben, Stuttgart 2012 ( Euro 79.-). An Amerikan edition is now in preparation. Please excuse the long delay. Sincerely yours Wolfgang Schad."