Glen of Imaal Terrier vs Sealyham Terrier
Quick answer
These two breeds differ most clearly in 7 recorded ways, set out below. Neither is better. FaunaHub compares what the registries publish and does not pick a winner — which dog suits a household depends on the individual animal and on circumstances no registry records.
Key differences
- Glen of Imaal Terrier carries the higher published weight figure (18.1 kg against 10.9 kg for the Sealyham Terrier).
- Published lifespan differs: 10-15 years for the Glen of Imaal Terrier, 12-14 years for the Sealyham Terrier.
- Glen of Imaal Terrier carries the higher published height figure (35.6 cm against 26.7 cm for the Sealyham Terrier).
- Their derived size bands differ: Glen of Imaal Terrier is medium, Sealyham Terrier is small.
- Shedding: Glen of Imaal Terrier is recorded in the lower band, Sealyham Terrier in the moderate band.
- Trainability: Glen of Imaal Terrier is recorded in the moderate band, Sealyham Terrier in the higher band.
- Vocality: Glen of Imaal Terrier is recorded in the lower band, Sealyham Terrier in the higher band.
Side by side
| Dimension | Glen of Imaal Terrier | Sealyham Terrier |
|---|---|---|
| Registry group | Terrier Group | Terrier Group |
| Adult size band | Medium | Small |
| Published height |
|
|
| Published weight |
|
|
| Coat length | Medium | Medium |
| Exercise needs | Moderate | Moderate |
| Grooming needs | Moderate | Moderate |
| Shedding | Lower | Moderate |
| Trainability | Moderate | Higher |
| Vocality | Lower | Higher |
| Published lifespan | 10–15 years | 12–14 years |
Trait rows are three-level bands normalised from a registry's published scale, never scores. “Trainability” describes how readily a breed is said to respond to structured training, not intelligence. “Shedding” is not an allergy signal — no breed is hypoallergenic. A blank means the registry records nothing, which is not the same as the two breeds matching.
Why these two breeds
Each of these breeds is listed as related to the other on the American Kennel Club's own breed pages. FaunaHub compares pairs where that relationship is mutual, so the premise of the comparison comes from the registry rather than from FaunaHub.
Related comparisons
Sources and further reading
Registry entries behind every value on this page. External links open in a new tab. Always confirm specific care decisions with a licensed veterinarian or reputable shelter.
- Breed organizationAmerican Kennel Club — Glen of Imaal Terrier — Breed Standard & Traits — AKC breed group and recognition tier, published height and weight ranges, life expectancy, coat length and type, and the AKC trait scale bands normalised into FaunaHub ordinal traits. Accessed 2026-09-13.
- Breed organizationAmerican Kennel Club — Sealyham Terrier — Breed Standard & Traits — AKC breed group and recognition tier, published height and weight ranges, life expectancy, coat length and type, and the AKC trait scale bands normalised into FaunaHub ordinal traits. Accessed 2026-09-13.
- VeterinaryAVMA — Pet Owner Resources — American Veterinary Medical Association pet-care hub
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