Feeding both wet and dry food is popular and perfectly fine — but it hides an easy trap: serving a full portion of each and quietly doubling the calories. Here's how to split one daily budget across both formats so your pet gets the best of each without the weight gain.
Combination feeding — offering both wet and dry food — is one of the most popular ways to feed cats and dogs, and for good reason. You get the hydration and palatability of wet food alongside the convenience and value of dry. But it also creates a portioning puzzle that trips up a lot of owners, and getting it wrong is a common, quiet cause of weight gain. The fix is simple once you see it. Here's how to mix wet and dry properly.
Why people mix in the first place
There are genuinely good reasons to combine formats. Wet food is around 70 to 80 percent water, so it boosts hydration — especially valuable for cats, who have a low thirst drive and are prone to urinary issues. It's also highly palatable, which helps picky eaters and older pets. Dry food, meanwhile, is convenient, keeps well, is often more economical, and is easy to measure and leave for later. Combining them lets owners capture the strengths of each, which is why so many households do it.
The trap: double-feeding
Here's where it goes wrong. Many owners look up the recommended amount of dry food and feed a full portion of that, then add wet food on top — or serve a full can of wet plus a normal scoop of dry. Either way, they've now fed close to two full meals' worth of calories in one day. Because the wet food doesn't look like much (it's mostly water), it's easy to underestimate, and the extra calories slip by unnoticed until the pet starts gaining weight. This double-feeding is the single most common combination-feeding mistake.
How to split the budget, step by step
The method is the same for cats and dogs. First, find your pet's total daily calorie target based on their ideal weight, age, activity, and neuter status. Second, decide roughly how you want to divide it — for example, half the calories from wet and half from dry, or a 70/30 split, whatever suits your pet and budget. Third, convert each share into an actual amount using the calorie content on each food's label. Our cat food portion calculator handles the conversion so you can serve a measured amount of each rather than guessing.
A quick worked example
Say your cat needs 250 calories a day and you want a roughly even split. That's about 125 calories from wet and 125 from dry. If your wet food provides 80 calories per can, that's a bit over one and a half small cans; if your dry food is 350 calories per cup, that's a bit over a third of a cup. Add them and you land near 250 — not the 400-plus you'd hit by feeding a full portion of each. The exact numbers depend on your specific foods, which is precisely why reading the label matters.
Read both labels
Because wet and dry foods differ so much in calorie density, you need the calorie content of each to split accurately — usually listed as kcal per can or per cup. Don't assume they're similar; a small can and a scoop of kibble can carry very different energy. Taking a moment to note both figures is what turns “some wet and some dry” into an actual plan, and it's the difference between combination feeding that keeps your pet lean and combination feeding that slowly adds weight.
Don't forget hydration and treats
Two footnotes. First, one of the best reasons to include wet food is hydration, so if you're feeding a cat mostly dry, even a portion of wet meaningfully helps their water intake — our cat water intake calculator shows how food moisture factors in. Second, treats still count toward the daily total in a combination diet just as in any other, so keep them to about ten percent of calories and subtract them from meals rather than piling them on top of an already-split budget.
Keeping it practical day to day
In a real household, you don't want to do arithmetic at every meal, so set the amounts once and stick to them. Decide your split, measure the wet and dry portions that hit the target, and — for dry especially — weigh it once so you know what the right scoop looks like. If multiple people feed your pet, agree on the amounts so nobody accidentally doubles up. A little setup makes accurate combination feeding effortless from then on.
Adjusting the ratio over time
Your split isn’t set in stone, and it’s fine to shift it as circumstances change. You might lean more heavily on wet food in summer or for a cat who needs more hydration, or tilt toward dry when budget or convenience matters more for a stretch. The one rule that stays constant is that the total calories should still add up to your pet’s daily target, whatever the ratio. As long as you re-do the simple split whenever you change the balance, you can adjust the mix freely without ever tipping your pet into a surplus.
Watch your pet, not just the math
As with any feeding plan, the numbers are a starting point that your pet’s body then refines. Feed your chosen split consistently for a few weeks, then check body condition — ribs easy to feel with light pressure, a visible waist — and adjust the total gently if your pet is gaining or losing when they shouldn’t. Combination feeding done this way gives you real flexibility: two formats, one honest calorie budget, and a pet whose weight you can steer just as precisely as if you fed a single food. That control is exactly what makes mixing worthwhile rather than risky. Owners who approach combination feeding this way tend to find it the most satisfying option of all, because they never have to choose between the hydration and taste of wet food and the convenience and value of dry — they simply get both, in the right amounts, at a cost and effort level that comfortably suits their own household, their weekly schedule, and their household budget.
The bottom line
Mixing wet and dry food is a great way to give your pet hydration, palatability, and convenience together — but only if you feed one daily calorie budget split across the two, rather than a full portion of each. Find the daily target, choose a split, convert each share using the labels, measure it out, and count treats within the total. Do that and combination feeding becomes exactly what it should be: the best of both bowls, without the extra pounds.
Frequently asked questions
Can I feed my pet both wet and dry food?
Yes, combination feeding is perfectly fine and popular — wet food adds hydration and palatability while dry adds convenience and value. The key is to feed one daily calorie budget split between the two, not a full portion of each, which would roughly double the calories and lead to weight gain.
How much wet and dry food should I feed if I mix them?
Start from your pet's total daily calorie target (based on ideal weight, age, and activity), then divide it between wet and dry — for example half and half, or 70/30. Convert each share into an amount using the calorie content on each label, and measure both. A portion calculator makes the conversion easy.
Why is my pet gaining weight on wet and dry food?
Almost always because of double-feeding: serving a full portion of dry plus a full portion of wet. Since wet food is mostly water it doesn't look like much, so its calories get underestimated. Feeding one calorie budget split across both formats, and counting treats within it, fixes the problem.
Is wet or dry food better for my pet?
Each has strengths, which is why many owners combine them. Wet food's high moisture supports hydration — particularly valuable for cats — and it's very palatable; dry food is convenient, economical, and easy to measure. There's no single winner; what matters most is feeding the right total amount, whichever formats you choose.