Mice on higher calorie diets had increased oxidative stress, disturbed lipid metabolism, suppressed glycolysis and altered gut - microbial metabolites compared to those on the calorie - restricted regimens. (sciencedaily.com)
Again, if you are talking about a very active pooch that swims in the rivers or lakes at least twice a week and has ample time playing outdoors on a daily basis, then this Labrador retriever will definitely need high calorie diet. (mypetneedsthat.com)
But the other high calorie diet that I think is very worthy of mentioning is the high fat diet that both Dipausquale and Duchaine have worked on. (fitnessandpower.com)