What size urn do I need for my dog or cat?
Pet urn sizes go by your pet's weight when they were well, not by the weight of the ashes. Allow one cubic inch of space for each pound they weighed, plus a tenth, plus 3 cubic inches. Enter their weight below to see the space they need and which of our urns holds it.
Last checked 13 November 2026
- Small
- Holds a pet up to 15 kg (33 lb)
- Medium
- Holds a pet up to 30 kg (66 lb)
- Large
- Holds a pet up to 40 kg (88 lb)
Their weight, the space they need.
Use their healthy weight, not the weight of the ashes. If you are between two numbers, round up.
845 ml
about 52 cubic inches
Our Medium urn holds a pet up to 30 kg (66 lb).
Pet urn size chart, by weight in kilograms
| Their weight | Space they need | Our urn size |
|---|---|---|
| 3 kg (7 lb) | 170 ml (10 cubic inches) | Small |
| 5 kg (11 lb) | 250 ml (15 cubic inches) | Small |
| 10 kg (22 lb) | 445 ml (27 cubic inches) | Small |
| 15 kg (33 lb) | 645 ml (39 cubic inches) | Small |
| 20 kg (44 lb) | 845 ml (52 cubic inches) | Medium |
| 25 kg (55 lb) | 1,045 ml (64 cubic inches) | Medium |
| 30 kg (66 lb) | 1,240 ml (76 cubic inches) | Medium |
| 35 kg (77 lb) | 1,440 ml (88 cubic inches) | Large |
| 40 kg (88 lb) | 1,640 ml (100 cubic inches) | Large |
| 45 kg (99 lb) | 1,835 ml (112 cubic inches) | Ask us before you order |
| 50 kg (110 lb) | 2,035 ml (124 cubic inches) | Ask us before you order |
How we work it out: one cubic inch of space for each pound they weighed, plus a tenth, plus 3 cubic inches. Small holds a pet up to 15 kg (33 lb), Medium up to 30 kg (66 lb) and Large up to 40 kg (88 lb).
Urn sizes by breed
Each breed page gives their usual weight, the space they need and the urn size that holds them, with the weight box opened at their weight.
See the breed pages: 25 dogs and 8 cats
Choosing a size, answered plainly.
What size urn do I need for my dog?
Allow one cubic inch of space for each pound your dog weighed when they were well, plus a tenth, plus 3 cubic inches.
We add a tenth and 3 cubic inches on top, so the ashes always fit. A 30 kg (66 lb) dog needs about 1,240 ml, which is 76 cubic inches. Our Small urn holds a dog up to 15 kg (33 lb), Medium up to 30 kg (66 lb) and Large up to 40 kg (88 lb).
What size urn do I need for a cat?
A cat of 3 to 6 kg (7 to 13 lb) needs about 170 to 290 ml of space, which is 10 to 18 cubic inches.
Our minimalist cat urn is one size and holds a cat up to 5.5 kg (12 lb). Our seated cat urn is sized to your cat's weight, and the Small size of our other urns holds a pet up to 15 kg (33 lb).
Do I use their weight, or the weight of the ashes?
Their weight when they were well. The weight of the ashes does not tell you the space they take up.
If you only know it roughly, use your best estimate and round up. Your vet will have a record of their last weight.
How much ashes will there be?
It varies from pet to pet, which is why an urn is sized from your pet's healthy weight and not from the ashes.
Allow one cubic inch of space for each pound your pet weighed when they were well, plus a tenth, plus 3 cubic inches: a 10 kg (22 lb) dog needs about 445 ml (27 cubic inches), and a 4 kg (9 lb) cat about 210 ml (13 cubic inches). Our sizes leave room for the ashes in their sealed bag.
Should I choose the next size up?
If their weight is close to the top of a size, yes: choose the next one.
Spare room inside an urn does no harm.
How much space is inside each White Doe urn?
About 645 ml in Small, 1,240 ml in Medium and 1,640 ml in Large.
That is 39, 76 and 100 cubic inches: the space for a pet at the top of each size. We make every urn to order in the size you choose.
What if my pet weighed more than 40 kg (88 lb)?
Ask us before you order, and we will tell you what we can make for them.
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For vets, crematoria and writers
Vets, crematoria and writers are welcome to use this chart with a link back to our pet urn size guide.
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A size for them, made to order.
See every urn, or answer a few quick questions and we will show you the pieces that fit.