How to Wash a Large Dog Bed Without Ruining It (Machine, Hand, and Spot-Clean Methods)

Large dog beds pick up drool, dander, mud, and that unmistakable “wet dog” smell faster than almost anything else in the house, and by 2026 most big-box washers still aren’t built to handle a 40×50-inch bolster bed stuffed with poly-fill or shredded foam. Washing a large dog bed the wrong way can leave it lumpy, moldy on the inside, or torn at the seams from being crammed into a machine it was never meant to fit. This guide walks through how to figure out what your bed is actually made of, which cleaning method fits that construction, and how to dry it so the filling doesn’t turn into a solid brick.

Start by identifying what’s inside the bed

Before you touch water, flip the bed over and check the manufacturer’s care tag. Large dog beds generally fall into one of four categories, and each one behaves differently in water:

Polyester fiberfill (the classic pillow-style stuffing)

This is the loose, cloud-like stuffing found in most orthopedic-style and donut/bolster beds from brands like Furhaven and Bedsure. It’s fairly washer-safe if it fits, but it absorbs a huge amount of water and takes a long time to dry, so it’s the filling most prone to mildew if you rush the drying step.

Shredded memory foam

Common in mid-range large beds, shredded foam holds odor well but also holds water. Fully submerging a shredded-foam insert in a washing machine is usually a bad idea unless the manufacturer explicitly says the liner is machine washable — foam bits can swell, clump, and never fully dry in the center, which leads to mold you can’t see or reach.

Solid orthopedic foam base (like Big Barker or PetFusion-style beds)

These beds are built around a single dense foam slab wrapped in a removable, washable cover. You almost never wash the foam itself — you wash the cover and wipe or spot-clean the foam core.

Elevated/cot-style beds with a fabric sling

K&H and other raised cot beds use a taut fabric panel stretched over a metal or PVC frame. These are the easiest large beds to clean because the fabric detaches entirely from the frame and there’s no filling to worry about.

Step 1: Vacuum and shake out loose hair and debris first

Run a vacuum with an upholstery attachment or a pet-hair brush over the entire surface before it goes anywhere near water. Wet fur mats into fabric fibers and gets much harder to remove once it’s soaked, so this five-minute step saves a lot of frustration later.

Step 2: Check whether it actually fits your washer

A lot of large dog bed damage happens because someone forces a queen-size bolster bed into a standard 3.5-cubic-foot home washer. If the bed is stuffed tight against the drum, the agitator can’t properly circulate water and detergent, and the seams take on stress they weren’t designed for. If your bed doesn’t have at least a few inches of room to move around in the drum:

• Take it to a laundromat with extra-large or commercial-capacity machines (typically 20 lb+ capacity).
• Wash the removable cover in your home machine and hand-wash or spot-clean the inner cushion separately.
• Fill a bathtub with warm water and a small amount of dog-safe or fragrance-free detergent and hand-agitate the whole bed, then rinse thoroughly and press out excess water before moving it.

Step 3: Use the right detergent and skip the extras

Fragrance-free, dye-free detergent is the safest bet — heavy perfumes and fabric softeners can irritate a dog’s skin and nose, and they often attract more dirt over time by leaving a slightly tacky residue on fabric fibers. Skip fabric softener and dryer sheets entirely; they coat fibers in a way that can reduce how well the fabric absorbs water (and drool) in the future, and some dogs react to the fragrance chemicals with excessive licking or scratching.

For odor control beyond regular detergent, a half-cup of white vinegar added to the rinse cycle cuts through ammonia smell from urine accidents without leaving a strong scent behind once it’s dry.

Step 4: Wash on cold or warm, never hot, and use gentle or delicate cycle

Hot water can break down the polyurethane foam structure in orthopedic bases and cause colors to bleed or fade faster on printed covers. Cold or warm water on a gentle/delicate cycle is enough to lift dirt, drool, and most odor-causing bacteria when paired with a full detergent cycle and adequate rinse time. If the bed has any water resistant or waterproof lining (common on Furhaven and Bedsure models with liners built for accident-prone dogs), stick to the gentle cycle so you don’t compromise the waterproof coating.

Step 5: Balance the load

A single large dog bed spinning alone in a big drum can throw the washer off balance, especially during the spin cycle. Add a couple of old bath towels to the load to help balance the weight and cushion the fabric against the drum walls.

Drying without turning the filling into a lumpy brick

Drying is where most large dog beds actually get ruined, not washing. Filling that isn’t fully dried before it’s used again traps moisture inside, and that’s exactly the environment mold and mildew need to take hold — and once mildew sets into thick fill, the smell is almost impossible to fully remove.

Machine drying (poly-fill and cover fabrics only)

Use low or no-heat/air-fluff settings. Toss in two or three clean tennis balls or wool dryer balls — they physically break up clumps of fiberfill as they tumble, which keeps the stuffing from settling into one dense corner. Expect to run multiple cycles; large beds often need 3-4 rounds of 30-45 minutes with the fill fluffed by hand in between.

Air drying (foam and anything oversized)

Foam pieces, whether shredded or solid, should never go in a hot dryer — heat can warp or degrade foam cell structure. Lay the piece flat on a drying rack (not directly on carpet or a towel that traps moisture underneath) in a well-ventilated room or outdoors in the shade, and flip it every few hours. A box fan aimed at the bed cuts drying time significantly and is worth the extra step for anything thicker than 2 inches.

How to tell it’s actually dry, not just dry on the surface

Squeeze the thickest part of the bed firmly. If you feel any coolness or dampness, or the fill still smells faintly of wet fabric, it needs more time. Beds that go back into use even slightly damp in the core are the ones that develop a musty smell weeks later that no amount of surface cleaning will fix.

Spot-cleaning between full washes

Full washes are hard on large beds, so most owners get more life out of them by spot-cleaning weekly and doing a full wash monthly or after major accidents. Mix a small amount of dish soap or pet-safe stain remover with warm water, blot (don’t scrub) the stained area with a cloth, then blot again with a clean damp cloth to rinse, and let air dry fully before the dog uses it again.

Related buying guides

• Best dog beds hub
• Bed sizes and dimensions guide
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• How we test at Talk Beds
• Bed frames with storage
• About Talk Beds

Written by

Sophie Laurent

Beds & Bedroom Editor

Sophie Laurent is TalkBeds' Beds & Bedroom Editor. With more than ten years covering home and furniture, she leads everything on the site that isn't the mattress itself: bed frames, platform beds, headboards, bunk and kids' beds, sizing, and the interiors decisions… Full profile & sources →