What to Put in a Kong: Stuffing Ideas That Keep Dogs Busy

What to Put in a Kong: The Short Answer

Stuff a Kong with a mix of your dog's regular kibble and a soft binder — peanut butter (xylitol-free only), plain canned pumpkin, plain yogurt, or mashed banana — then freeze it. The binder holds the loose food in place so the toy dispenses slowly instead of dumping in thirty seconds, and freezing multiplies the working time. An unfrozen Kong typically occupies a dog for a few minutes; a well-packed frozen one commonly buys 20 to 45 minutes, sometimes longer for a methodical licker.

That's the whole method. Everything below is refinement: which fillers work best, how to layer for difficulty, recipes worth memorizing, and the safety lines you shouldn't cross.

One prerequisite before any of it: the Kong has to be the right size and formula for your dog. A too-small toy is a choking hazard, and a determined power chewer needs the harder rubber version. Our dog toy sizing guide covers how to match toy dimensions to your dog's mouth — read it first if you're buying rather than stuffing.

Why Stuffed Kongs Work So Well

A stuffed Kong converts a meal from a 90-second event into a project. Licking and working food out of a rubber cavity is a naturally calming, repetitive behavior for most dogs, which is why frozen Kongs show up in nearly every separation-anxiety and crate-training protocol trainers use.

For power-chewer households specifically, there's a second benefit: a dog working a food puzzle is a dog not shredding your couch cushion. Destructive chewing is often under-stimulation wearing a disguise, and food-dispensing toys are one of the cheapest fixes available. If your dog demolishes standard treat toys, pair this article with our puzzle toys heavy chewers can't brute-force apart — the stuffing techniques here apply to most stuffable rubber toys, not just the Kong brand.

The Building Blocks: Safe Fillers by Role

Think of Kong stuffing in three layers, each with a job.

Base (the bulk): your dog's regular kibble or a portion of their wet food. Using their normal ration keeps calories under control — you're relocating dinner, not adding to it.

Binder (the glue): something soft and sticky that traps the base in place.

• Peanut butter — plain, and check the label for xylitol (sometimes listed as "birch sugar"), which is toxic to dogs. Use a thin smear, not a fill; it's calorie-dense.
• Plain canned pumpkin — not pie filling, which is spiced and sweetened. Low-calorie and gentle on most stomachs.
• Plain unsweetened yogurt or a little cottage cheese — skip these if your dog doesn't handle dairy well.
• Mashed banana or unsweetened applesauce.
• Canned dog food — the easiest binder of all, and already nutritionally complete.

Prizes (the payoff): a few high-value bits buried inside — training treats, a spoonful of plain cooked chicken, freeze-dried liver, blueberries, or carrot pieces. Prizes keep a dog committed when the easy food runs out.

Quick-reference filler table

Never put these in a Kong

Xylitol in any form, chocolate, grapes or raisins, onions, garlic, chives, macadamia nuts, cooked bones, alcohol, or anything heavily salted or spiced. When in doubt about a human food, leave it out — kibble plus one known-safe binder is always enough.

Keep total daily treats and extras to roughly 10% of your dog's calories, which is the guideline most veterinarians give. The cleanest way to stay under it is the one already mentioned: stuff the Kong with food you would have fed anyway.

Easy Kong Stuffing for Beginners: Start Loose, Then Freeze

If your dog has never worked a stuffed Kong, don't start with a frozen brick — dogs who fail early often quit on the toy entirely. Build difficulty in stages:

1. Level 1 — free win. Loose kibble and a couple of treats, no binder. Food falls out almost immediately. The dog learns the toy pays.
2. Level 2 — light binder. Kibble with a smear of peanut butter or pumpkin at the opening. Served fresh, unfrozen.
3. Level 3 — packed and chilled. Layered stuffing, refrigerated an hour or two so it firms up.
4. Level 4 — frozen solid. The full project. Most dogs are ready within a week or two of daily practice.

Move up one level only when your dog empties the current one confidently. A dog that walks away from a half-full Kong is telling you the difficulty jumped too fast.

Frozen Kong Recipes Worth Memorizing

No measuring required — the cavity is the measuring cup. Fill, freeze overnight on a small plate or in a mug (open end up), and serve.

The Weeknight Standard. Layer kibble moistened with warm water or dog-safe broth, drop two or three high-value treats in the middle, cap the opening with a smear of pumpkin. The everyday workhorse: cheap, balanced, freezes hard.

The Summer Cooler. Plain yogurt mixed with blueberries and a little mashed banana. Lighter and hydrating — a good hot-weather option for dogs who tolerate dairy.

The Long Haul. Canned dog food packed tight, a strip of plain cooked chicken pushed deep into the small end, peanut butter seal at the opening. Densest of the three — save it for crate sessions, guests, or work calls you can't have interrupted.

The Diet-Friendly. Kibble bound with pumpkin only, carrot bits as prizes. Lowest-calorie build here, and the one to reach for if your dog is on a weight-management plan.

Batch-prep tip: stuff several Kongs on Sunday and freeze them in a container. A frozen Kong straight from the freezer is dinner-plus-entertainment on demand all week.

How Long Does a Frozen Kong Last?

It depends on packing density, freezing, and your dog's style, but rough expectations:

Times vary widely by individual dog — an experienced Lab may gut a frozen Kong in fifteen minutes while a small methodical licker nurses it for over an hour. Track your own dog's times and pack accordingly.

To stretch duration: pack tighter, freeze fully (overnight, not two hours), seal the opening with a binder cap, and wedge a few large prizes that must be worked past. To shorten it for a beginner, do the opposite.

Kong Fillers for Heavy Chewers

Two separate issues here: the toy and the technique.

The toy: power chewers should be working the harder black-rubber extreme version rather than the standard red, sized up so the dog can't get the whole toy between the molars. Even then, no rubber toy is truly indestructible — inspect it regularly and retire it once the rubber cracks, the opening tears, or pieces shed. A damaged Kong is a swallowing hazard, not a keepsake.

The technique: heavy chewers tend to attack the rubber when the food stops coming easily. Counter that by making the food channel more rewarding than the chewing — freeze solid so licking is the productive strategy, avoid wedging hard treats so large the dog gives up and gnaws the toy instead, and take the Kong away once it's empty rather than leaving it as a chew object. Frustration is what turns a feeder into a casualty.

Supervise the first several sessions with any dog, and always with a known destroyer.

Cleaning: The Step Everyone Skips

A Kong cycling through wet food, dairy, and dog saliva grows funk fast. Rinse after every use, and give it a real wash — hot water, dish soap, and a bottle brush for the cavity — at least a few times a week in heavy rotation. Kong states its classic rubber toys are dishwasher safe on the top rack, which is the low-effort option. Sniff test before restuffing: if it smells sour, wash again. Our guide to cleaning dog toys covers deep-cleaning rubber, plus rope and plush, step by step.

Beyond the Kong

Stuffed Kongs are the gateway. Once your dog is hooked on working for food, a rotation of feeders, snuffle mats, and lick mats keeps the novelty alive and the couch intact — our complete enrichment guide for destructive dogs maps out how to build that rotation without buying gear your dog will defeat in a day.

Start tonight with the Weeknight Standard, level 2 difficulty. By next week you'll have a freezer drawer of them and a dog who hears the freezer open and comes running.