If you’re here because you’re trying to make one practical decision after losing your Boston Terrier, I’m so sorry. This guide keeps urn sizing simple and steady—so you can choose a capacity that fits comfortably without second-guessing it.
Quick answer
- Sizing rule: plan for about 1 cubic inch per pound of body weight.
- Boston Terriers top out around 25 lb in the breed standard, and many are close to that line.
- Minimum capacity: roughly your dog’s weight in pounds (example: 20 lb → 20 cu in).
- Comfort range: add about 15–20% (example: 20 lb → ~24 cu in).
- Most Boston Terriers fit in Small or Medium—and if your dog was near 25 lb or weight is an estimate, Medium is usually the calmer choice.
Start shopping here: Pet Urns for Dogs. For Boston Terriers, compare: Small Pet Urns and Medium Pet Urns.
The sizing rule (1 cubic inch per lb) and why we still size up
Urn capacity is measured in cubic inches. The simplest estimate is one cubic inch of capacity for every pound of body weight. Many families choose a little more than the minimum so the inner bag settles easily and the closure doesn’t feel tight—especially when your dog’s weight is an estimate or close to a category cutoff.
If you’d like to double-check your number, use the Pet Urn Size Calculator and compare it with the Urn Size Chart & Complete Guide.
Boston Terrier weight to urn capacity (cubic inches)
The Boston Terrier breed standard divides weight into classes up to 25 lb. If you have a recent vet record, use that number. If not, estimate and choose extra capacity for comfort—especially if you’re near 25 lb.
| Your Boston Terrier’s weight | Minimum capacity (1:1) | Comfort capacity (add ~20%) | Usually a good fit in |
|---|---|---|---|
| 12 lb | 12 cu in | 15 cu in | Small |
| 15 lb | 15 cu in | 18 cu in | Small |
| 20 lb | 20 cu in | 24 cu in | Small (roomier capacity recommended) |
| 25 lb (top-end / boundary) | 25 cu in | 30 cu in | Medium (usually the calmer choice) |
| 28–30 lb (larger / overweight) | 28–30 cu in | 34–36 cu in | Medium |
Which Funeral.com size category fits most Boston Terriers?
If your Boston Terrier was on the smaller side, Small often works well. But many Boston Terriers sit close to the 25 lb line, and that’s where choosing Medium can feel easier—more breathing room, less fussing with the inner bag, and a calmer closure.
Tip: Shop by listed capacity. Some designs (especially photo urns or memory-box styles with compartments) can have less usable interior space than they look like 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 Boston Terriers, the key “don’t cut it close” moment is when your dog is near 25 lb. If you’re near that line, Medium usually removes the stress.
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 20 lb Boston Terrier?
Start with 20 cubic inches minimum. For a roomier fit, aim for about 24 cubic inches (+20%). Many dogs at this weight still fit in Small, but choose a higher listed capacity so it doesn’t feel tight.
What size urn do I need for a 25 lb Boston Terrier?
Start with 25 cubic inches minimum. For comfort, aim for about 30 cubic inches. Because 25 lb is a common cutoff, Medium is usually the calmer choice.
Should I choose Small or Medium for my Boston Terrier?
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.
My dog’s weight is only an estimate. What should I do?
Use your best estimate and choose extra capacity for comfort. If you’re between two sizes, the larger option is usually the calmer choice.
Does a big frame or muscular build change urn size?
It can. If your Boston Terrier was big-framed or very muscular (or you want the easiest closure with the inner bag), choosing a roomier capacity can prevent a tight fit.
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, aim for your comfort target (or size up) so the fit doesn’t feel tight.
Can a keepsake urn hold my Boston Terrier’s full ashes?
Sometimes, depending on your dog’s weight and the keepsake urn’s listed capacity. If you’re sharing ashes, keepsakes are a great option alongside a primary urn. 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.
