| A | B |
| AAFCO | Association of American Feed Control Officers |
| Additives | Non-energy, non-nutrient substances to enhance flavor, color, stability |
| Calories | used to measure the energy that is released when nutrients are burned |
| Complete and balanced | food meets nutritional and energy requirements |
| Digestibility | Biologic availability |
| Guaranteed analysis | listing of minimums and maximums of specific nutrients in a food (crude protein, crude fat, crude fiber, and moisture are required) |
| Humectants | Inhibit mold & fungal growth |
| Macrominerals | minerals required in relatively large quantities |
| MER | Maintenance energy requirement |
| RER | Resting energy requirement |
| Nutrient | Any substance that the animal eats which supports life |
| Palatability | how well an animal likes the taste of a food |
| Ad lib feeding | food is available at all times |
| Cognitive dysfunction | senility |
| Hypoglycemia | abnormally low blood sugar |
| Nutraceutical | extracts of foods claimed to have a medicinal effect |
| Obligate carnivore | unable to meet nutrients requirements without meat in the diet |
| Enteral | given via the gastrointestinal (GI) tract |
| Hydrolyzed | conventional protein broken into smaller molecules |
| Novel | protein never exposed to |
| PEG tube | percutaneous endogastric tube |
| TPN | total parenteral nutrition |