The present invention generally concerns the management of age-related diseases in domestic animals. Specifically, the present invention is directed to combination therapies for the treatment of progressive renal diseases (e.g., Chronic Renal Failure) and their accompanying secondary disease states. In a composition aspect, the present invention provides a composition comprising a phosphate binder and another pharmaceutically active ingredient. The other pharmaceutically active ingredient is selected from a group consisting of antihypertensives, calcitrol, vitamin D analogues, lipid restriction products, potassium salts, treatments for anemia and alkalization compounds.