Hill's Prescription Diet d/d Feline Duck & Green Pea Formula vs. Smack Purrfect Pork
 
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Hill's has a better protein to fat ratio. Smack's ratio of 1.33 to 1 is too low (too fatty). (The ideal ratio is 2 to 1.) Smack has fewer ingredients, which is usually a good thing. Smack has a slightly lower concentration of fruits, veggies, grains, and starches. Smack is 100% pea-free; Hill's has peas as its 1st ingredient.
Hill's Prescription Diet d/d Feline Duck & Green Pea Formula
                                                             Hill's has a better protein to fat ratio. Smack's ratio of 1.33 to 1 is too low (too fatty). (The ideal ratio is 2 to 1.)
                                                
First 10 ingredients:
yellow peas pea protein duck green peas pork fat powdered cellulose calcium sulfate chicken liver flavor fish oil lactic acid
Smack Purrfect Pork
                                                                                                                                     Smack has fewer ingredients, which is usually a good thing.
                                                                                 Smack has a slightly lower concentration of fruits, veggies, grains, and starches.
                                                                                 Smack is 100% pea-free; Hill's has peas as its 1st ingredient.
                                                
First 10 ingredients:
pork pork bone pork liver pork kidneys pork spleen pork tongue pork heart organic pumpkin organic celery organic apple
| Hill's Prescription Diet d/d Feline Duck & Green Pea FormulaKibble | Smack Purrfect PorkFreeze-Dried Raw | |
| 
        Score F | 
        Score A+ | |
| Food Type | Kibble | Freeze-Dried Raw | 
| Meat % | Unknown | 88% | 
| Protein % | 34.5% | 40% | 
| Fat % | 21.3% | 30% | 
| Fiber % | 4.7% | 1.8% | 
| Protein to Fat Ratio | 1.62 to 1 | 1.33 to 1 | 
| Total Ingredients | 22 | 14 | 
| Meat Content | 4 total low concentration, high quality | 6 total high concentration, high quality | 
| Non-Meats | 3 total low concentration | 6 total low concentration | 
| Pea-free | No, 1st Ingredient | Yes | 
| Sugar-free | Yes | Yes | 
| Controversial ingredient-free | Yes | Yes | 
| Prescription needed 
        
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