Which size urn?

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How large the urn should be depends on the (live) weight of your pet.
The guideline is that you need 100 ml per 2.2 kg of live weight.

The following table can be used as an indication.

 content urn            suited for pets up to
 50 ml  1,1 kg
 100 ml  2,2 kg
 200 ml  4,4 kg
 300 ml  6,6 kg
 400 ml  8,8 kg
 0,5 ltr  11 kg
 1 ltr  22 kg
 1,5 ltr  33 kg
 2 ltr  44 kg
 2,5 ltr  55 kg
 3 ltr  66 kg
 3,5 ltr  77 kg
 4 ltr  88 kg

 

In the case that you already have the ashes of your pet, you can use the guideline that you need 0.7 ltr per 1 kilo of ash.
Weigh the ash without the container or urn. You can place the ashes in a plastic bag for weighing.