No, a cat cannot safely be fed a vegetarian diet: cats are strict carnivores (hypercarnivores) whose bodies depend on nutrients found only in animal tissues, such as taurine, preformed vitamin A, and arachidonic acid, which they cannot synthesize in sufficient quantities.
A metabolism shaped by millions of years of carnivory
Unlike dogs or humans, cats have lost the ability through evolution to produce certain essential compounds efficiently from plant precursors. Taurine, an amino acid abundant in meat and fish, is the most well-documented example: cats can produce only a minimal amount from cysteine and methionine, far below their actual needs. A diet lacking animal sources therefore leads to rapid deficiency.
Taurine deficiency has two well-established consequences: dilated cardiomyopathy, which progressively weakens the heart muscle, and retinal degeneration that can lead to blindness. Similarly, cats cannot efficiently convert plant beta-carotene into active vitamin A and require the preformed type found in liver and animal fats. The same applies to arachidonic acid, an essential fatty acid that only animal fats provide in adequate amounts, whereas most other mammals can synthesize it from plant-based linoleic acid.
A marked difference from other domestic carnivores
Dogs, as opportunistic omnivores, tolerate a predominantly plant-based diet much better because they retain the metabolic pathways cats have lost. This distinction explains why nutritional recommendations cannot be transferred between species. Any non-standard diet, including vegetarian or vegan options, must be carefully developed and monitored by a veterinarian, who alone can verify nutritional balance and detect any deficiencies before they become clinically apparent.
