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1. Cupp, C. J., Kerr, W.W., Jean-Philippe, C., Patil, A. R., & Perez-Camargo, G. (2008). The role of nutritional interventions in the longevity and maintenance of long-term health in aging cats. International Journal of Applied Research in Veterinary Medicine, 6(2), 69-81. 

2. Kealy, R.D., Lawler, D.F., Ballam, J. M., Mantz, S. L., Biery, D. N., Greeley, E.H., … Stowe, H.D. (2002). Effects of diet restriction on life span and age-related changes in dogs. Journal of the American Veterinary Medical Association. 220, 1315–1320.

3. Penell, J. C., Morgan, D. M., Watson, P., Carmichael, S., & Adams, V. J. (2019). Body weight at 10 years of age and change in body composition between 8 and 10 years of age were related to survival in a longitudinal study of 39 Labrador retriever dogs. Acta Veterinaria Scandinavica, 61(1), 42.

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5. Datz C. A. (2010). Noninfectious causes of immunosuppression in dogs and cats. The Veterinary clinics of North America. Small animal practice, 40(3), 459–467.

6. Laflamme, D. P. (2013). Protein requirements of aging cats based on preservation of lean body mass. Proceedings of the 13^th Annual AAVN Symposium (17). Washington, USA. 

7. Laflamme, D. P., & Hannah, S. S. (2013). Discrepancy between use of lean body mass or nitrogen balance to determine protein requirements for adult cats. Journal of Feline Medicine and Surgery, 15(8), 691–697.

8. Wannemacher, R.W., &  McCoy, J.R. (1966). Determination of optimal dietary protein requirements of young and old dogs. Journal of Nutrition, 88(1), 66-74.

9. Perez-Camargo, G., Patil, A. R., & Cupp, C. J. (2004). Body composition changes in aging cats. Compendium on Continuing Education for the Practicing Veterinarian, 26(Suppl 2A), 71. 

10. Cupp, C. J., & Kerr, W.W. (2010). Effect of diet and body composition on life span in aging cats. (2010). Nestlé Purina Companion Animal Nutrition Summit (36-42). Florida, USA. 

11. Laflamme, D.P., & Hannah, S.S. (2005). Increased dietary protein promotes fat loss and reduces loss of lean body mass during weight loss in cats. International Journal of Applied Research in Veterinary Medicine, 3(2), 62-68. 

12. Hannah, S.S. & Laflamme, D.P. (1998). Increased dietary protein spares lean body mass during weight loss in dogs. Journal of Veterinary Internal Medicine, 12, 224.

13. Laflamme, D.P. (1997). Development and validation of a Body Condition Score System for Cats: A clinical tool. Feline Practice, 25, 5-6, 13-18.

14. Laflamme, D.P. (1997). Development and validation of a Body Condition Score System for Dogs. Canine Practice, 22(4), 10-15.

15. Bjornvad, C.R., Nielsen, D.H., & Armstrong, P.J. (2011). Evaluation of a nine-point body condition scoring system in physically inactive pet cats. American Journal ofVeterinary Research, 72(4), 433-437.  

16. German, A.J., Holden, S.L., Moxham, G.L., Holmes, K.L., Hacket, R.M., & Rawlings, J. M. (2006). A simple, reliable tool for owners to assess the body condition of their dog or cat. Journal of Nutrition, 136(7), 2031S-2033S. 

17. Mawby, D.I., Bartges, J.W., D'Avignon, A., Laflamme, D.P., Moyers, T.D., & Cottrell, T. (2004). Comparison of various methods for estimating body fat in dogs. Journal of the American Animal Hospital Association, 40(2), 109-114.

18. Freeman, L. M., Sutherland-Smith, J., Cummings, C., & Rush, J. E. (2018). Evaluation of a quantitatively derived value for assessment of muscle mass in clinically normal cats. American Journal of Veterinary Research, 79(11), 1188–1192.

19. Freeman, L. M., Michel, K. E., Zanghi, B. M., Vester Boler, B. M., & Fages, J. (2019). Evaluation of the use of muscle condition score and ultrasonographic measurements for assessment of muscle mass in dogs. American Journal of Veterinary Research, 80(6), 595–600.

20. Michel, K. E., Anderson, W., Cupp, C., & Laflamme, D. P. (2011). Correlation of a feline muscle mass score with body composition determined by dual-energy X-ray absorptiometry. The British Journal of Nutrition, 106 Suppl 1, S57–S59.

1. Fontana, L., Partridge, L., & Longo, V. D. (2010). Extending healthy life span--from yeast to humans. Science (New York, N.Y.), 328(5976), 321–326.

2. Kaeberlein, M., Creevy, K. E., & Promislow, D. E. (2016). The dog aging project: translational geroscience in companion animals. Mammalian genome: official journal of the International Mammalian Genome Society, 27(7-8), 279–288.

3. Kealy, R.D., Lawler, D.F., Ballam, J.M., Mantz, S.L., Biery, D.N., Greeley. E.H., & Stowe, H.D. (2002). Effects of diet restriction on life span and age-related changes in dogs. Journal of the American Veterinary Medical Association, 220, 1315-1320.

4.  Lawler, D.F., Larson, B.T., Ballam, J.M., Smith, G.K., Biery, D.N., Evans, R.H., & Kealy, R.D. (2008). Diet restriction and ageing in the dog: major observations over two decades. British Journal of Nutrition, 99(4), 793-805.

5. Smith, G. K., Paster, E. R., Powers, M. Y., Lawler, D. F., Biery, D. N., Shofer, F. S., McKelvie, P. J., & Kealy, R. D. (2006). Lifelong diet restriction and radiographic evidence of osteoarthritis of the hip joint in dogs. Journal of the American Veterinary Medical Association, 229(5), 690–693.

6. Kealy, R.D., Lawler, D.F., Ballam, J.M., Lust, G., Biery, D.N., Smith, G.K., & Mantz, S.L. (2000). Evaluation of the effect of limited food consumption on radiographic evidence of osteoarthritis in dogs. Journal of the American Veterinary Medical Association, 217(11), 1678-1680.

    Additional research related to this 14-year study: 

6.1. Huck, J. L., Biery, D. N., Lawler, D.F., Gregor, T. P., Runge, J. J., Evans, R.H., Kealy, R.D., & Smith, G. K. (2009). A longitudinal study of the influence of lifetime food restriction on development of osteoarthritis in the canine elbow. Veterinary Surgery, 38(2), 192- 198.

6.2. Greeley, E. H., Kealy, R.D., Ballam, J. M., Lawler, D. F., & Segre, M. (1996). The influence of age on the canine immune system. Veterinary Immunology and Immunopathology, 55(1-3), 1-10.

6.3. Greeley, E.H., Ballam, J.M., Harrison, J.M., Kealy, R.D., Lawler, D.F., & Segre, M. (2001). The influence of age and gender on the immune system: a longitudinal study in Labrador Retriever dogs. Veterinary Immunology and Immunopathology, 82(1-2), 57-71.

6.4. Greeley, E.H., Spitznagel, E., Lawler, D.F., Kealy, R.D., & Segre, M. (2006). Modulation of canine immunosenescence by life-long caloric restriction. Veterinary Immunology and Immunopathology, 111(3-4), 287-299.

6.5. Kealy, R.D., Olsson, S.E., Monti, K.L., Lawler, D.F., Biery, D.N., Helms, R.W., Lust, G., & Smith, G.K. (1992). Effects of limited food consumption on the incidence of hip dysplasia in growing dogs. Journal of the American Veterinary Medical Association, 201(6), 857-863.

6.6. Kealy, R.D., Lawler, D.F., Ballam, J.M., Lust, G., Smith, G.K., Biery, D.N., & Olsson, S.E. (1997). Five-year longitudinal study on limited food consumption and development of osteoarthritis in coxofemoral joints of dogs. Journal of the American Veterinary Medical Association, 210(2), 222-225.

6.7. Larson, B. T., Lawler, D.F., Spitznagel, E. L., & Kealy, R.D. (2003). Improved glucose tolerance with lifetime diet restriction favorably affects disease and survival in dogs. Journal of Nutrition, 133(9), 2887-2892.

6.8. Lawler, D.F., Evans, R. H., Larson, B.T., Spitznagel, E. L., Ellersieck, M. R., & Kealy, R. D. (2005). Influence of lifetime food restriction on causes, time, and predictors of death in dogs. Journal of the American Veterinary Medical Association, 226(2), 225-231.

6.9. Lawler, D. F., Ballam, J. M., Meadows, R., Larson, B. T., Li, Q., Stowe, H. D., & Kealy, R. D. (2007). Influence of lifetime food restriction on physiological variables in Labrador retriever dogs. Experimental Gerontology, 42(3), 204-214.

6.10. Lawler, D. F., Larson, B. T., Ballam, J. M., Smith, G. K., Biery, D. N., Evans, R. H., & Kealy, R. D. (2007). Diet restriction and ageing in the dog: major observations over two decades. British Journal of Nutrition, 99(4), 793-805.

6.11. Richards, S. E., Wang, Y., Lawler, D., Kochhar, S., Holmes, E., Lindon, J. C., & Nicholson, J. K. (2008). Self-modeling curve resolution recovery of temporal metabolite signal modulation in NMR spectroscopic data sets: application to a life-long caloric restriction study in dogs. Analytic Chemistry Journal, 80(13), 4876-4885.

6.12. Richards, S. E., Wang, Y., Claus, S. P., Lawler, D., Kochhar, S., Holmes, E., & Nicholson, J. K. (2013). Metabolic phenotype modulation by caloric restriction in a lifelong dog study. Journal of Proteome Research, 12(7), 3117-3127.

6.13. Runge, J. J., Biery, D. N., Lawler, D. F., Gregor, T. P., Evans, R. H., Kealy, R. D., Szabo, S. D., & Smith, G. K. (2008). The effects of lifetime food restriction on the development of osteoarthritis in the canine shoulder. Veterinary Surgery, 37(1), 102-107.

6.14. Smith, G. K., Lawler, D. F., Biery, D. N., Powers, M. Y., Shofer, F., Gregor, T. P., & Kealy, R. D. (2012). Chronology of hip dysplasia development in a cohort of 48 Labrador retrievers followed for life. Veterinary Surgery, 41(1), 20-33.

6.15. Stowe, H. D., Lawler, D. F., & Kealy, R. D. (2006). Antioxidant status of pair-fed Labrador retrievers is affected by diet restriction and aging. Journal of Nutrition, 136(7), 1844-1848.

6.16. Szabo, S. D., Biery, D. N., Lawler, D. F., Shofer, F. S., Powers, M. Y., Kealy, R. D., & Smith, G. K. (2007). Evaluation of a circumferential femoral head osteophyte as an early indicator of osteoarthritis characteristic of canine hip dysplasia in dogs. Journal of the American Veterinary Medical Association, 231(6), 889-92.

6.17. Wang, Y., Lawler, D., Larson, B., Ramadan, Z., Kochhar, S., Holmes, E., & Nicholson, J. K. (2007). Metabonomic investigations of aging and caloric restriction in a life-long dog study. Journal of Proteome Research, 6(5), 1846-1854.

1. Cupp, C. J., Kerr, W.W., Jean-Philippe, C., Patil, A. R., & Perez-Camargo, G. (2008). The role of nutritional interventions in the longevity and maintenance of long-term health in aging cats. International Journal of Applied Research in Veterinary Medicine, 6(2), 69-81. 

2. Cupp, C. J., & Kerr, W. W. (2010). Effect of diet and body composition on life span in aging cats.  Nestlé Purina Companion Animal Nutrition Summit, Florida, USA, 36-42.

3. Cupp, C. J., Jean-Philippe, C., & Kerr, W. W. (2006). Effect of Nutritional Interventions on Longevity of Senior Cats. International Journal of Applied Research in Veterinary Medicine, 4(1), 34-50.