Wet or dry food to protect a cat's urinary tract?

Wet food has an edge for urinary health: its water dilutes the urine and lowers mineral supersaturation. Kibble stays possible if hydration is supported by fountains, added water or some wet food. With a urinary history, the format and formula are validated with the vet, total water intake being the central issue (International Cat Care). Expert deep dive ### Why does wet food have the edge? Wet food holds about 75 to 80% water against 8 to 10% for kibble. This water dilutes the urine and lowers supersaturation for both struvite and oxalate, two crystals sensitive to urine concentration. For a cat that drinks little spontaneously, food water is more reliable than bowl water (PMC, 2024). The wet advantage therefore rests mainly on the passive hydration it provides. ### Should kibble be banned? No. According to International Cat Care, the issue is total water intake, not the format itself. Kibble can work if hydration is supported: fountains, several water points, added water or broth, some wet food alongside. Surprising fact: composition (the starch-to-protein ratio) weighs as much as form, so a well-formulated kibble and a well-hydrated cat can suffice in an animal with no history. With a history, the choice tracks the crystal and veterinary advice. Comparison table | Criterion | Wet food | Kibble | |---|---|---| | Water content | about 75-80% | about 8-10% | | Effect on urine concentration | more dilute urine | more concentrated urine | | Hydration to make up | no | yes, via fountains and added water | | Suits no-history cats | yes | yes if hydration supported | Petipedia's take Petipedia favours total water intake for urinary health, without banning kibble, and refers any history to the vet.