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Size guide & how to measure

Pet coats and jumpers are sized mainly by back length, with chest girth as a second check. Back length matters most for coverage.

How to measure

Back length: measure along the spine from the base of the neck (collar area) to the base of the tail.
Chest: measure around the widest part of the ribcage, behind the front legs.
If the two measurements suggest different sizes, choose by back length and allow for the chest.

Size	Typical back length	Typical chest
XS	20–25 cm	30–40 cm
S	25–32 cm	38–50 cm
M	32–40 cm	48–62 cm
L	40–50 cm	60–76 cm
XL	50–60 cm	74–92 cm

Ranges are approximate and vary by style. Always check this product’s Specifications for its exact measurements.

Specifications

Material: Cloth

Full description

Most pet fancy dress is a flat printed shape and a photograph that flatters it. This one has jointed legs that stand away from the body and move as your pet moves, which is what makes the spider read as a spider from across a room rather than as a black bib. The body section sits over the shoulders and the legs splay out from there, so it works on a cat or a small dog equally well.

Sitting over the shoulders rather than round the neck matters more than it sounds: it puts the weight on the strongest part of the body and keeps nothing pressing on the throat. The legs are the whole point and also the thing to watch, because they catch on furniture, doorframes and other pets. A costume like this belongs in an open room for a few minutes, not on a walk. Three sizes and three colourways are listed.

Jointed spider legs that move with your pet
Sits over the shoulders rather than around the neck
Sizes small, medium and large
Colourways listed as red, black, and black with red
Suits cats and small dogs

Two things worth knowing. Costumes are for short, supervised periods only — never leave one on an unattended pet, overnight, or during rough play, and take it off the moment your pet freezes, flattens or starts reversing out of it. We also hold no measurements from the maker, so we would rather measure the costume for you than repeat a size chart we cannot verify. Chest girth behind the front legs is the number to send us.

Who it's for: Anyone dressing a tolerant cat or small dog for a Halloween photo or a short party appearance, who wants something with real shape to it.

Delivery

Tracked UK delivery — your estimated arrival date is shown above and updates automatically. Standard delivery £2.99, and free on orders over £39. Full details on our delivery information page. Delivery information

Returns

14 days to change your mind, no interrogation. Items need to be unused (sensory products unopened, for hygiene). Full details on our delivery & returns page.

Payment

Secure checkout by Stripe — cards, Apple Pay, Link and Klarna. We never see or store your card details.

Common questions

Which options can I choose from?

Black / M, Black / S, Red / M, Red / S, Black / L, Black Red / M, Black Red / L, Red / L, Black Red / S. Pick one above before adding to your basket.

How long does delivery take?

Your estimated delivery date is shown above and updates automatically. UK orders are sent tracked — standard delivery is £2.99, and free on orders over £39.

How do I track my order?

As soon as your order is dispatched we email you a tracking link, so you can follow it all the way to your door.

How do I choose the right size?

Use the size guide above to measure your pet, then pick the size whose range your measurement falls within. If you’re between sizes, size up. Still unsure? Email us before you order.

What is it made from?

Cloth. Full specifications are listed above.

What if I need to return my order?

You have 14 days from delivery to change your mind. Just email us with your order number and we’ll send the return steps the same working day — see our delivery & returns page for details.

Dog costumesDog spider costumeHalloween

Jointed Spider Pet Costume

A spider costume with jointed legs that sits over the shoulders.

Colour

Size

£13.99

Not sure of the size? Check the measuring guide

· tracked · 14-day promise

UK delivery £2.99 · free over £39

Secure checkout by Stripe · Card, Apple Pay & Klarna

Two things worth knowing

Costumes are for short, supervised periods only — never leave one on an unattended pet, overnight, or during rough play, and take it off the moment your pet freezes, flattens or starts reversing out of it. We also hold no measurements from the maker, so we would rather measure the costume for you than repeat a size chart we cannot verify. Chest girth behind the front legs is the number to send us.

Secure checkout

Tracked delivery

Easy returns

ClothShipped tracked to the UK

Why we chose it

The jointed legs stand away from the body, so it reads as a spider across a room rather than a black bib. It sits over the shoulders, nothing pressing on the throat. Indoors only, the legs catch.

— Matt, founder

Why buy from Giddy Pets?

Carefully selected by pet ownersEvery product is chosen and quality-checked by people who actually live with dogs, cats and small pets.
Tracked delivery on every orderUK delivery with tracking as standard — and it’s free when you spend over £39.
UK customer supportReal, UK-based humans read every email — usually Matt, the founder. No bots, no ticket numbers.
Easy returns14 days to change your mind, no interrogation. If it’s not right, we’ll make it right.