Peanut butter Kong recipes: 5 easy fillings your dog will love

If you have ever stuffed a Kong with peanut butter and handed it to your dog, you already know how well it works. What you might not know is that peanut butter on its own is just the beginning. The right filling combinations can triple how long your dog stays engaged, make the toy genuinely calming for anxious dogs, and turn a simple treat into a full mental enrichment session.

This post gives you 5 easy, trainer-tested recipes that work in any stuffable enrichment toy, whether you have a Kong, a Toppl, or a cup-style toy like our Pineapple Enrichment Cup. Every recipe includes exact amounts, freeze times, calorie estimates, and the specific situations each one works best for.

One rule applies to all 5: always freeze. A room-temperature filling lasts 3-5 minutes. The same filling frozen solid lasts 20-35 minutes. Freezing is the single biggest upgrade you can make to any stuffable toy session.

➡️ New to stuffable enrichment toys? See our complete guide.

Before you start: the peanut butter rule

Peanut butter is the most popular Kong filling for good reason. Most dogs love it, it freezes well, and it acts as a natural binder that holds other ingredients together inside the toy.

The one non-negotiable: always check the label for xylitol before buying. Xylitol is an artificial sweetener that is highly toxic to dogs and appears in some peanut butter brands, especially reduced-sugar or "natural" varieties. The label should list only peanuts, or peanuts and salt. Nothing else.

Also keep it plain and unsalted when possible. Your dog doesn't need added sodium, and the natural peanut flavor is more than enough to keep them interested.

Good options most grocery stores carry: Smucker's Natural, Teddie, or store-brand natural peanut butter with a short ingredient list.

Recipe 1: Classic peanut butter and banana (the beginner recipe)

Best for: Dogs trying a stuffable toy for the first time, puppies, picky eaters who need an easy win

This is the recipe to start with if your dog has never used a stuffable toy before. The combination of peanut butter and banana is almost universally appealing to dogs, the texture freezes predictably, and the mild sweetness from the banana makes even skeptical dogs curious.

Ingredients (for 1 standard-size toy):

• 2 tbsp plain, unsalted, xylitol-free peanut butter
• 1/2 ripe banana, mashed
• 1 tbsp plain water or low-sodium bone broth to loosen the mix

How to make it: Mash the banana until smooth, then stir in the peanut butter. Add water or broth to thin the mixture until it's spoonable but not runny. Spoon into your toy, tap it on the counter a few times to remove air pockets, and freeze.

Freeze time: 5-6 hours, or overnight Estimated calories: 190-210 total (adjust serving size for smaller dogs) Session length frozen: 15-25 minutes depending on your dog's licking style

Trainer tip: For a dog's very first session, don't freeze this one. Offer it at room temperature so your dog discovers what the toy is all about without any added difficulty. Once they understand the game, start freezing.

Use this recipe in the Pineapple Enrichment Cup for easy filling with no leak concerns.

Recipe 2: Peanut butter and pumpkin swirl (the digestion supporter)

Best for: Dogs with sensitive stomachs, dogs who eat too fast, any dog who needs a fiber boost

Pumpkin and peanut butter is a combination that works on every level. Pumpkin is one of the most gut-friendly foods you can add to a dog's diet. It's high in soluble fiber, which supports healthy digestion, and its naturally thick texture blends with peanut butter to create a filling that stays frozen longer than peanut butter alone.

Ingredients:

• 2 tbsp xylitol-free peanut butter
• 3 tbsp canned plain pumpkin (pumpkin puree, not pumpkin pie filling)
• 1 tsp plain Greek yogurt (optional, adds a slight tang dogs enjoy)

How to make it: Stir pumpkin and peanut butter together until combined. The mixture will be thick, which is exactly what you want for a long-lasting frozen session. Add a small spoonful of yogurt if using and swirl it through without fully mixing so you get visible layers. Spoon firmly into the toy and freeze.

Freeze time: 5-6 hours Estimated calories: 160-180 total Session length frozen: 20-30 minutes

Trainer tip: This is one of the best recipes for dogs who struggle with separation anxiety. The dense texture keeps them focused for longer, which is exactly what you want during a pre-departure routine. Offer it 5-10 minutes before you leave so your dog is already settled and licking by the time you walk out the door.

Recipe 3: Peanut butter, kibble, and beef liver (the high-value training reward)

Best for: High-energy dogs, sessions where you need maximum motivation, dogs who have gotten bored of standard peanut butter fillings

This is the recipe to use when you need your dog fully engaged. Adding freeze dried beef liver to a peanut butter base dramatically increases the aroma and perceived value of the filling. The kibble adds bulk and texture variation so your dog has to work through different layers to get to the good stuff.

Ingredients:

• 2 tbsp xylitol-free peanut butter
• 2 tbsp regular kibble
• 4-6 small pieces freeze dried beef liver, crumbled

How to make it: Mix the crumbled liver into the peanut butter so the aroma is distributed throughout. Layer the kibble into the toy first, then spoon the peanut butter and liver mixture over the top, pressing firmly to fill any gaps. The kibble embedded in the base creates a more interesting texture challenge as the filling thaws.

Freeze time: 4-5 hours Estimated calories: 200-230 total (varies by kibble brand) Session length frozen: 20-30 minutes

Trainer tip: This filling works exceptionally well for crate training. The combination of kibble and high-value liver makes the crate a genuinely desirable place rather than something to avoid. Offer it every time your dog goes in the crate for the first few weeks.

➡️ Shop our single ingredient freeze dried beef liver treats.

Recipe 4: Peanut butter, yogurt, and blueberry layer (the antioxidant boost)

Best for: Senior dogs, dogs recovering from illness, summer enrichment, any dog who needs variety

This recipe is lighter than the others and works beautifully as a summer cooling treat. Blueberries are high in antioxidants, yogurt provides natural probiotics, and peanut butter ties it all together. The visual layers also make this one of the most satisfying to prep if you enjoy putting a little extra care into your dog's enrichment.

Ingredients:

• 1 tbsp xylitol-free peanut butter
• 3 tbsp plain Greek yogurt (full fat for most dogs, low fat for weight management)
• 6-8 fresh or frozen blueberries

How to make it: Start with a thin smear of peanut butter at the base of the toy to plug any small openings and add aroma from the bottom up. Layer yogurt over the peanut butter, then drop blueberries in so they're distributed throughout. Finish with another small layer of peanut butter across the top. Freeze upright in a cup or small bowl so layers don't shift.

Freeze time: 5-6 hours Estimated calories: 120-140 total Session length frozen: 15-20 minutes (yogurt and fruit thaw slightly faster than pure peanut butter)

Trainer tip: For summer heat specifically, add a splash of low-sodium bone broth to the yogurt layer before freezing. It dilutes the calories further and creates a slushier middle layer that many dogs find extremely satisfying on hot days.

➡️ More summer enrichment ideas for your dog - Link to your summer dog safety blog post]

Recipe 5: Peanut butter, sweet potato, and salmon (the protein powerhouse)

Best for: Active dogs with high protein needs, dogs with skin and coat issues, dogs who need omega-3s

This is the most nutritionally dense recipe on the list. Sweet potato provides complex carbohydrates and fiber, salmon adds omega-3 fatty acids that support skin, coat, and joint health, and peanut butter binds everything together. The combination of scents from the peanut butter and salmon also makes this one of the highest value fillings for nose driven dogs.

Ingredients:

• 1 tbsp xylitol-free peanut butter
• 3 tbsp cooked mashed sweet potato (no seasoning, no butter)
• 2 tbsp canned salmon in water, drained and no salt added, flaked

How to make it: Mash the sweet potato until smooth. Fold in the flaked salmon. Spoon the sweet potato and salmon mixture into the toy first, packing firmly to remove air pockets. Finish with a layer of peanut butter across the top opening. Freeze.

Freeze time: 6 hours or overnight Estimated calories: 170-200 total Session length frozen: 25-35 minutes

Trainer tip: This filling packs well in larger capacity toys. If you're using a cup shaped toy with around 1 cup of capacity, you can double the recipe and offer half as a full meal replacement, which saves prep time on busy training days.

Our Pineapple Enrichment Cup holds approximately 1 cup of filling, ideal for larger recipes like this one.

How to get the longest possible session from any filling

Beyond the recipe itself, a few technique details consistently extend how long a frozen session lasts:

Pack firmly. Air pockets inside the filling collapse when the outside layer thaws, which causes the center to fall out too quickly. After each spoonful, tap the toy on the counter and press the filling down with a spoon or your finger before adding more.

Freeze longer. 4 hours gets the outside frozen. 8-12 hours (overnight) gets the center frozen solid, which is where the extra session length comes from. When possible, prep toys the night before.

Plug the opening. For cone shaped toys with a small hole at the narrow end, plug it with a peanut butter dab before filling and allow it to set for a few minutes in the freezer before adding the rest of the recipe. Cup shaped toys with no secondary hole skip this step entirely.

Finish the surface. Leave a thin, visible smear of peanut butter at the opening before freezing. This gives your dog an immediate reward at the start of the session, which motivates them to keep working for the filling inside.

Store pre-made. Prep 4-5 toys at once on a Sunday, freeze them all, and store in a sealed freezer bag. Pull one out as needed throughout the week. Most fillings stay fresh in the freezer for up to 4 weeks.

Pairing stuffable toys with other enrichment tools

Stuffable toys work even better as part of a broader enrichment routine rather than as a standalone activity. A simple approach that many dog parents use:

Morning: Snuffle mat feeding with kibble and a few pieces of freeze dried liver mixed in. Engages your dog's nose and sets a calm tone for the day.

Midday or before leaving: Frozen stuffable toy. Keeps your dog occupied and calm for 20-30 minutes, ideally timed to your departure if you're addressing separation anxiety.

Evening: Training session using freeze dried treats as rewards, followed by a second snuffle mat or puzzle toy session to wind down.

This structure gives your dog 3 distinct mental enrichment touchpoints across the day without requiring significant time investment from you.

➡️ Shop the snuffle mat to pair with your stuffable toy routine.

Frequently asked questions

Can I use these recipes in any stuffable toy, not just a Kong? Yes. All 5 recipes work in any stuffable, freezable enrichment toy including Toppl-style toys, ring-shaped toys, and cup-shaped toys like our Pineapple Enrichment Cup. The only adjustment needed is quantity: scale up or down based on your toy's capacity. Cup-shaped toys with wider openings are especially easy to fill with chunkier recipes like the salmon and sweet potato version.

How often can I give my dog a stuffed frozen toy? Daily use is completely fine for most dogs as long as you account for the calories in the filling. If you're using the toy as a meal replacement, measure carefully so your dog gets their correct daily calorie amount. If it's an extra enrichment session on top of regular meals, keep the filling on the lighter side (broth-based or yogurt-based rather than pure peanut butter).

My dog finishes the frozen toy in under 5 minutes. What am I doing wrong? Most likely either the filling wasn't packed firmly enough (air pockets let it fall out quickly) or the freeze time wasn't long enough to solidify the center. Try packing more tightly, freezing overnight instead of just a few hours, and using a denser base like peanut butter or Greek yogurt rather than broth. If your toy is also very small for your dog's size, upgrading to a larger capacity toy makes a significant difference.

Is peanut butter safe for dogs every day? In small amounts, yes. The concern with daily peanut butter feeding is calorie accumulation since it's calorie dense. Stick to 1-2 tablespoons per session for a medium-sized dog and factor those calories into their daily total. For small dogs, 1 teaspoon is a more appropriate amount.

Can puppies have these recipes? Yes, with 2 adjustments. First, use smaller amounts appropriate for your puppy's weight. Second, skip the salmon recipe until your puppy is at least 4-6 months old and has a more established digestive system. The peanut butter and banana recipe is the best starting point for puppies and works beautifully for teething since the frozen texture soothes sore gums.

Do I need to supervise my dog with a stuffable toy? For dogs who are familiar with stuffable toys and don't try to destroy them, supervision isn't required. For first-time users, puppies, and heavy chewers, supervise the first several sessions to make sure your dog is licking rather than trying to chew pieces off the toy. Replace any toy that shows cracks or structural damage.

Can I refreeze a toy my dog has partially used? No. Once your dog has licked a toy, saliva introduces bacteria that multiply quickly when refrozen and thawed again. Toss any partially used filling and clean the toy before refilling.

 

Final Thoughts

A stuffable toy with the right filling is one of the highest-return enrichment investments you can make. Five minutes of prep gives your dog 20-30 minutes of calm, focused mental activity, and with these 5 recipes in rotation, the novelty stays high enough that your dog will genuinely look forward to every session.

Start with recipe 1 if your dog is new to stuffable toys. Move to the others once they've got the hang of it. And don't forget to freeze.

➡️ Shop the Pineapple Enrichment Cup for easy filling, large capacity, and no leak concerns.

Best regards to you and your pup,

Xing, CPDT-KA & Mika 💜