If you’re here because you’re trying to make one practical decision after losing your Cavalier, I’m sorry. This guide walks you through urn sizing in a simple, calm way—so you can choose a capacity that fits comfortably without second-guessing it.
Quick answer
- Rule of thumb: choose about 1 cubic inch per pound of body weight.
- Typical adult Cavalier weight: about 13–18 lb.
- Minimum capacity: about 13–18 cubic inches.
- Comfort range (roomier fit): about 16–22 cubic inches.
- Most Cavaliers fit best in a Small urn, but if you’re close to the top end (or unsure), Medium can be the calmer choice.
Start shopping here: Pet Urns for Dogs. Most Cavaliers will shop comfortably in: Small Pet Urns. If you want extra breathing room: Medium Pet Urns.
The sizing rule (1 cubic inch per lb) and why we still size up
Urn capacity is measured in cubic inches. A practical estimate is 1 cubic inch per pound of your dog’s weight. Many families add a comfort buffer so the inner bag settles easily and the closure doesn’t feel tight—especially if weight is an estimate or you want room for a small memento.
If you’d like to double-check your numbers, use the Pet Urn Size Calculator and compare it with the Urn Size Chart & Complete Guide.
Cavalier King Charles Spaniel weight to urn capacity (cubic inches)
If you have a recent vet record, use that number. If not, use your best estimate and choose extra capacity for comfort. Cavaliers are often small enough for the Small tier, but many are close enough to the cutoff that sizing up can make the fit feel easier.
| Your Cavalier’s weight | Minimum capacity (1:1) | Comfort capacity (add ~20%) | Usually a good fit in |
|---|---|---|---|
| 13 lb | 13 cu in | 16 cu in | Small |
| 15 lb | 15 cu in | 18 cu in | Small |
| 18 lb | 18 cu in | 22 cu in | Small (top end) |
| 20 lb | 20 cu in | 24 cu in | Small or Medium (more breathing room) |
Which Funeral.com size category fits most Cavaliers?
Most Cavalier King Charles Spaniels fit best in a Small pet urn. Small is usually plenty of capacity for the typical Cavalier weight range, while still looking proportionate in your home. If your dog was near the top end of the range (or you want room for mementos), choosing Medium can make the fit feel easier.
Tip: Shop by listed capacity. Some designs (especially photo urns or memory-box styles with compartments) can have less usable interior space than they appear to from the outside.
Size up if… (a simple rule that prevents a tight fit)
Size up if your dog’s weight is an estimate, your dog is a mix, your dog is big-framed or very muscular, you want room for mementos (tag, note, fur clipping), or you want the easiest closure with the inner bag. If your dog’s weight is close to the top of this size tier, choosing the next tier up is usually the calmer choice because it avoids a tight fit. For Cavaliers, “close to the top” often means your comfort estimate lands in the low 20s (or you’re near the cutoff and want breathing room), so moving up to Medium can feel simpler.
Sharing plan options (keepsakes and jewelry)
If more than one person wants a portion of ashes, a gentle plan is one primary urn plus keepsakes (or jewelry) so you don’t have to reopen the main urn repeatedly.
Helpful tools to confirm your choice
FAQ
What size urn do I need for a 15 lb Cavalier King Charles Spaniel?
Start with 15 cubic inches minimum. For a more comfortable fit, aim for about 18 cubic inches (+20%). Most families choose a Small urn at this weight.
What size urn do I need for an 18 lb Cavalier?
Is a Small urn big enough for most Cavaliers?
Yes. Most Cavaliers fit well in Small. The key is choosing an urn whose listed capacity meets or exceeds your comfort target.
When should I choose Medium instead of Small?
Choose Medium if your Cavalier was near the top end of the weight range, weight is an estimate, you’re adding mementos, or you want the easiest closure with the inner bag.
How much extra space (buffer) should I add?
A common approach is to add about 15–20% to your minimum estimate. This helps avoid a tight fit and makes the inner bag easier to place.
What if I don’t know my Cavalier’s exact weight?
Use your best estimate and choose extra capacity for comfort. If you want to confirm the math, use the Pet Urn Size Calculator.
Can I include a collar tag or small mementos in the urn?
Often, yes—if you plan for it. If you want room for a tag, note, or small keepsake, choose an urn that meets your comfort target (or size up) so the fit doesn’t feel tight.
Can a keepsake urn hold a Cavalier’s full ashes?
Sometimes. It depends on your dog’s weight and the keepsake urn’s listed capacity. If you’re sharing ashes, keepsakes are a great option. See Pet Keepsake Urns.
What if I’m splitting ashes between family members?
Consider one primary urn plus keepsakes or jewelry so you don’t have to reopen the main urn repeatedly. See Pet Keepsake Urns and Pet Cremation Jewelry.
How can I double-check my sizing before ordering?
Use the Pet Urn Size Calculator and compare it with the Urn Size Chart & Complete Guide. Then choose an urn whose listed capacity meets or exceeds your comfort target.
