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 33 lb (15 kg)
- Medium
- Holds a pet up to 66 lb (30 kg)
- Large
- Holds a pet up to 88 lb (40 kg)
Their weight, the space they need.
Use their healthy weight, not the weight of the ashes. If you are between two numbers, round up.
53 cubic inches
about 860 ml
Our Medium urn holds a pet up to 66 lb (30 kg).
Pet urn size chart, by weight in pounds
| Their weight | Space they need | Our urn size |
|---|---|---|
| 8 lb (4 kg) | 12 cubic inches (195 ml) | Small |
| 12 lb (5 kg) | 16 cubic inches (265 ml) | Small |
| 20 lb (9 kg) | 25 cubic inches (410 ml) | Small |
| 30 lb (14 kg) | 36 cubic inches (590 ml) | Small |
| 40 lb (18 kg) | 47 cubic inches (770 ml) | Medium |
| 50 lb (23 kg) | 58 cubic inches (950 ml) | Medium |
| 60 lb (27 kg) | 69 cubic inches (1,130 ml) | Medium |
| 65 lb (29 kg) | 74 cubic inches (1,220 ml) | Medium |
| 70 lb (32 kg) | 80 cubic inches (1,310 ml) | Large |
| 80 lb (36 kg) | 91 cubic inches (1,490 ml) | Large |
| 88 lb (40 kg) | 100 cubic inches (1,640 ml) | Large |
| 90 lb (41 kg) | 102 cubic inches (1,670 ml) | Ask us before you order |
| 100 lb (45 kg) | 113 cubic inches (1,850 ml) | 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 33 lb (15 kg), Medium up to 66 lb (30 kg) and Large up to 88 lb (40 kg).
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 66 lb (30 kg) dog needs about 1,240 ml, which is 76 cubic inches. Our Small urn holds a dog up to 33 lb (15 kg), Medium up to 66 lb (30 kg) and Large up to 88 lb (40 kg).
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 33 lb (15 kg).
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 88 lb (40 kg)?
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.