Stuffable Dog Toys: What to Fill Them With and What to Avoid

By dogbowwow · Updated November 2, 2026

a brown and white dog with a ball in its mouth

Disclosure: As an Amazon Associate we earn from qualifying purchases. This guide is educational and is not a substitute for advice from your veterinarian.

Most owners buy a stuffable dog toy expecting an easy win, fill it with peanut butter, and watch the dog empty it in four minutes. The toy is fine. The filling approach is the issue. A hollow rubber toy is closer to a tiny kitchen project than a finished product, and the way you build it decides whether it lasts three minutes or forty.

The other side of the project is safety. Some of the most common fillings, including certain peanut butters, can be dangerous, and some toys are the wrong size or shape for particular dogs. This guide covers how to choose a toy, how to build it in layers, which fillings are safe, which foods to keep far away, and how to handle freezing, calories and cleaning.

Quick Answer

Pack a hollow rubber toy in layers, with kibble or wet food at the bottom and a sticky plug at the opening, then freeze it for a longer challenge. Always check labels for xylitol, avoid onion, garlic, grapes, raisins and chocolate, and count the filling as part of your dog's daily food.

Start With the Right Toy

The filling matters less than the toy. Check three things before you buy or reuse one.

Size. The toy should be large enough that your dog cannot swallow it or wedge it deep into the mouth. Err on the larger side for strong chewers, and re-evaluate if the toy has worn down.

Openings. A large opening makes food easy to reach, which suits beginners. A small opening makes the dog work harder with the tongue, but make sure the dog’s tongue or lower jaw cannot get stuck. If your dog ever ends up wearing a toy on the muzzle, retire it.

Wall thickness and condition. Thin walls split. A toy with deep cracks or chunks missing should be replaced; our guide to when to throw away a dog toy shows what to look for. For dogs who destroy toys quickly, see our guide to choosing toys for power chewers, which compares materials.

Freezer-safe designs are common, but not all are, so read the maker’s notes before you chill one.

Build in Layers and Raise the Difficulty

A well-built stuffed toy is a ladder. You start low and climb as your dog improves.

Level one: loose and open. Drop a few kibbles and a spoonful of soft food inside. Everything falls out with a shake. Use this to show a new dog what the toy is for.
Level two: packed. Press the food in so it sticks together. Add a plug of something sticky at the opening, such as mashed banana or a dog-safe spread.
Level three: layered. Alternate soft and dry layers: wet food, kibble, soft food, a treat wedged in the narrow end. Different textures keep a dog interested.
Level four: frozen. Freeze a layered toy. This stretches the session to a half hour or more for many dogs. For puppies, freeze only lightly and stay close, as our teething guide explains.
Level five: small-opening or locked. Use a smaller opening or wedge a larger treat so only a determined dog gets it.

Move up only when your dog finishes a level calmly. If the dog gives up and walks away, return to the previous level.

Fillings Compared

The table below sorts common fillings by what to know. It is not a recipe card, and the portions are up to you and your dog’s needs.

Filling	Notes
Regular kibble	Easy base layer; soak lightly to help it bind
Plain canned dog food	Sticks well and freezes well; use the daily ration
Plain canned pumpkin	Choose 100 percent pumpkin, not pie filling, which has sugar and spices
Mashed ripe banana	Sticky plug; sugary, so use small amounts
Plain unsweetened yogurt	Only for dogs who tolerate dairy; check the label for sweeteners
Peanut butter or other nut butter	Rich in fat; only if the ingredients list has no xylitol
Cooked mashed sweet potato	Plain only; skip butter, salt and seasonings
Small pieces of dog-safe fruit	Blueberries, for example; no grapes or raisins
Dog-safe commercial stuffing pastes	Convenient; read the ingredients and count the calories

Keep portions modest and fresh. Food that is left out in a warm room for a day can spoil, so empty and wash the toy at the end of each session.

The Xylitol Rule

Xylitol can appear under “birch sugar” on some labels. If you are unsure, do not use the product. A plain, unsweetened alternative such as mashed pumpkin or wet dog food is the safer option.

Foods That Do Not Belong in Any Toy

A few ingredients come up repeatedly, so learn them.

Onion and garlic, in any form, including powders. Human broths and baby foods often contain them, so read the label.
Grapes and raisins. These can cause kidney damage in dogs.
Chocolate and anything with cocoa.
Macadamia nuts.
Cooked bones, which can splinter.
Very fatty or salty foods, such as bacon grease, sausage, and processed cheese. Rich foods can upset the stomach and may trigger pancreatitis in susceptible dogs.
Anything your veterinarian has told you to avoid for allergies, medical diets or weight control.

For a wider look at what goes into a dog’s bowl, the AAFCO guidance on choosing pet food provide general information.

Counting Calories Without a Calculator

A stuffed toy is food, and the extras add up, especially if you fill one several times a day. Without worrying about precise numbers, the simplest approach is to use your dog’s own meal. Measure the portion, put it in the toy, and count nothing extra. If you add a treat or a spoonful of spread, take a little out of the next meal.

Puppies and dogs on prescription diets need extra care. Puppy food is made for growth, so fill toys from the same bag your puppy already eats; our puppy food guide explains how to choose it. Dogs on special diets should keep to them, and your veterinarian can tell you what is acceptable as a topper or filler.

Freezing Without Frustration

Freezing is the best trick for extending a stuffed toy, but a poorly built one can become a brick that frustrates your dog.

Stand the toy upright in a tall glass or mug so the filling does not run out.
Use thin layers of soft food rather than one solid block.
Leave a little room at the open end so the dog can reach the first layer.
For a beginner, freeze only the last third.
Prepare several at once and keep them in a freezer bag so you have them ready.

Serve frozen toys on a surface you do not mind cleaning, like a washable mat or a tiled floor, since melting food gets messy. If your dog tries to bite the toy to extract frozen food, pull it back and move down a level.

Cleaning a Toy That Holds Food

Sticky fillings leave residue in every groove. Rinse the toy right after use, then wash with hot, soapy water and a bottle brush. Some rubber toys are dishwasher safe, which makes cleanup easy, but check the label. Dry completely before the next fill. A toy that smells sour or has a film that will not wash off should be replaced.

Picture Three Dogs and Their Toys

Picture a young boxer mix who gulps his dinner. His owner fills a medium rubber toy with the same kibble, adds a spoonful of wet food, and freezes it. Dinner can now take fifteen minutes, and his owner uses a tiled corner of the kitchen.

Picture a small terrier with a sensitive stomach. She gets a softly packed toy with plain pumpkin and her own kibble, because richer fillings upset her. Her owner never uses spreads.

Picture a powerful mastiff cross who chews hard. His owner fills a thick rubber toy only when he is home, freezes it, and takes it away afterward, checking for cracks every time. Our guide to toys for dogs left alone covers when a stuffed toy is appropriate for unsupervised time.

Mistakes That Spoil Stuffed Toys

Skipping the label check. Peanut butter without a label read is a gamble.
Using the whole day’s treats. Count the filling as food.
Overstuffing at the start. A beginner needs wins.
Leaving food in the toy. Warm rooms spoil fillings.
Ignoring wear. A split toy leads to swallowed pieces.
Offering to a guarding dog in a shared space. Separate dogs during stuffed toy time.

Frequently Asked Questions

Can I use peanut butter in a stuffable toy?

Yes, if the ingredients are free of xylitol and your dog tolerates it. Use a small amount, since it is high in fat. Alternatives like pumpkin or wet dog food are lighter.

How long should a frozen stuffed toy last?

That varies by dog, filling and room temperature. Most dogs take longer with a frozen toy than with a loose one. If your dog finishes in a few minutes, build a harder version.

Can puppies use stuffable toys?

Yes, and they can help during teething when a cold toy feels soothing. Choose a size suited to a small mouth, use their usual puppy food, and supervise.

My dog gets diarrhea after stuffed toys. Why?

Rich fillings and sudden diet changes are common causes. Return to your dog’s regular food as the filling, and ask your veterinarian if the problem continues.

Can I put bones or rawhide in a stuffable toy?

Do not. Cooked bones splinter, and rawhide is a choking and blockage risk. Stick to food that is soft and appropriate.

How do I know the toy is too small?

If your dog can fit the toy fully in the mouth, swallow it, or get it stuck behind the teeth, it is too small. Go up a size.

One Toy, Three Fillings, One Week

Choose a single toy of the right size and try three simple fillings over the week: your dog’s own kibble with a spoonful of wet food, a banana plug, and a frozen version. Note which one holds your dog’s attention longest, check the toy for wear each time, and build from there.