As I was reviewing the vaccine titers we have run during the past several years, it became apparent that dogs fed high quality food (usually home prepared) and given supplements almost always had very high titers. Vaccine titers measure the level of antibodies in the dog’s serum. When the titer is adequate, the dog is immune to a given disease. These dogs also tended to maintain high titers over the years. Dogs that were fed foods of lesser quality started with lower titers which often declined from year to year. This would seem to be another good reason to prepare food at home- and to add appropriate supplements.
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