 The recommendations for the CA supply for maintenance of dogs have been reduced by about 75% in the last decades. CA requirements for maintenance may vary with food DM intake and digestibility. Fecal DM excretion has a considerable impact on fecal CA losses in a practical feeding situation. The data from a fiber model study could be transferred to prepared moist and dry dog food. This article was authored by Ellen Kienzel, Thomas Brenton, and Britta Dobinecka.