How to choose the right size dog bed — measure your dog, match the bed shape, and avoid the most common sizing mistakes UK owners make.
Buying the right dog bed size is not just about length. A dog that sprawls, curls, leans or burrows will use the space differently, and that changes what counts as a good fit.
This page is here to stop the usual mistake: buying the bed that fits the room, not the dog. Good sizing affects comfort, support, washability and how long the bed still looks worth owning after a few months of real use.
A bed that is too small forces awkward sleeping positions that can cause joint problems over time, particularly in older dogs. A bed that is too big can be fine for some dogs, but it often wastes money and gives less useful side support for dogs that like to curl or lean into the edges. The goal is a bed that fits how your dog actually sleeps, not how you imagine they would use it if the room were bigger.
This is simpler than measuring for a harness or coat. You need one number: nose-to-tail length with the dog lying flat and stretched out. That is your baseline.
Wait until the dog is lying fully stretched — properly stretched, not curled. Measure from the tip of the nose to the base of the tail. Add 15 cm to this number. That is the minimum bed length you need. For dogs that sleep diagonally (most of them, at some point) add 20–25 cm instead.
For width, a rough guide is to use the same measurement you took for length if the dog likes to stretch sideways, or about two-thirds of the nose-to-tail length if they curl tightly.
This is where most people get it wrong. They buy a rectangle because it is practical. Their dog curls into a tight ball and falls off the edge for years.
The curler: Dog sleeps in a tight curl, nose close to tail. A round or oval bed with raised edges (donut style or bolster) keeps the warmth in and gives the dog a solid surface to curl against. A flat rectangular mat is wasted space on this dog.
The stretcher: Dog sleeps fully extended on their side, legs out, taking up maximum possible space. Needs a flat rectangular bed that is genuinely big enough to accommodate full stretch. An orthopaedic flat mat is often the best option.
The leaner: Dog sleeps with their back against something — a wall, a sofa leg, your leg. A bolster bed (raised sides on three sides) is almost exactly what this dog wants.
The burrower: Dog disappears under blankets or digs at bedding before lying down. A cave-style bed or a bed with a separate blanket they can rearrange is what works here.
Most dogs use more than one position at different times. If it varies, a rectangular bed with raised bolster sides (three-sided) is a reasonable compromise.
Flat mat / orthopaedic flat: A low-profile rectangular foam or memory foam pad. Best for stretchers, older dogs with stiff joints, large breeds that need support rather than enclosure.
Bolster bed: A rectangular bed with raised padded sides on three or all four edges. Suits leaners and dogs that like the security of something to press against. Also useful as a crate insert.
Donut / round bed: Deep, round, high-sided. Suits curlers perfectly and holds heat well. Not the right choice for a stretcher. Not ideal for dogs with poor mobility because the high sides require physical effort to climb into.
Raised / elevated bed: A platform bed on legs, often with a fabric or mesh surface. Good for hot dogs, dogs that sleep outdoors or in warm rooms. Does not offer cushioning or warmth.
Cave / igloo bed: Enclosed with a hooded or tent-style top. Specifically for dogs that like to burrow or feel contained. Small and medium breeds tend to use these.
Buying too small is the single most common problem. If you are unsure between two sizes, go bigger.
Not accounting for age or joint changes: A five-year-old Lab in good condition and the same Lab at ten are very different dogs. Buy ahead of the problem if your dog is already showing stiffness.
Buying a round bed for a stretcher: Common because donut beds look appealing and are widely marketed. Watch how your dog actually sleeps first.
Ignoring washability at the point of purchase: A bed that cannot be machine washed will eventually become unhygienic.
Choosing a bed that fits the corner, not the dog: The bed needs to fit the dog. If there is no space where a properly sized bed will go, rethink the room layout rather than compromising the dog's comfort.
Usually yes, but not wildly bigger. The bed needs to accommodate full stretch plus a margin. For a curler, a bed that is substantially bigger than the curled body is mostly wasted space. Measure for the stretched-out length, add 15 cm, and match the bed type to the sleeping position.
Yes, and sooner rather than later. An orthopaedic flat mat or a low-sided bolster bed with proper foam support is the right upgrade. Real memory foam, low sides, and a washable cover.
Once you know the right size, these are the two beds we recommend first — one general-purpose and one orthopaedic for senior or large dogs.
Approx. price: ~£60
Memory foam filling in a proper box-bed shape with raised side walls for dogs that like to lean and curl. The removable herringbone fabric cover is machine washable, and the inner lining is water-resistant. Better support than most beds with "orthopaedic" in the name.
Approx. price: ~£60
Memory foam filling in a box-bed shape with raised walls, a herringbone outer cover and a machine-washable removable liner. The memory foam actually redistributes pressure rather than just compressing flat, which is what separates it from cheaper "orthopaedic" beds.
Usually yes, but not wildly bigger. The bed needs to accommodate full stretch plus a margin. For a curler, a bed that is substantially bigger than the curled body is mostly wasted space. Measure for the stretched-out length, add 15 cm, and match the bed type to the sleeping position.
Yes, and sooner rather than later. An orthopaedic flat mat or a low-sided bolster bed with proper foam support is the right upgrade. Real memory foam, low sides, and a washable cover.
Usually one of three things: the bed is too hot, the bed is the wrong shape for how they sleep, or they simply prefer the location of the spot they have chosen over the location of the bed. Try moving the bed to where the dog already sleeps before buying something different.
When the foam or filling has lost most of its structure, when washing no longer gets it clean enough, or when the dog stops using it. Good orthopaedic beds last 3–5 years with regular washing. Cheaper filled beds often compress within a year.
A few obvious extras that buyers on this page almost always need. We do not keep specific picks for these — the Amazon search results for each are consistently good.
You need this to measure the dog stretched out before picking a bed size. A £3 sewing tape measure is all it takes.
Typically £
Find on Amazon →Extends the life of any dog bed by catching accidents before they reach the foam. Worth having for every dog, essential for puppies and seniors.
Typically £
Find on Amazon →