Best DNA test for terrier mix after conflicting results

Getting two different results from two different DNA tests is genuinely frustrating — and unfortunately it's more common with terrier mixes than people realise, because terrier breeds share a lot of genetic overlap and smaller databases struggle to pull them apart accurately. DNA tests for dogs have improved a lot, but the quality gap between providers is real: it comes down to how many genetic markers they analyse and how large their reference database is. Before I point you in a clear direction, a couple of quick questions — is your main goal nailing down the breed mix as accurately as possible, or are you also interested in health screening? And do you know anything at all about her background, or is she a complete mystery?

That's a classic terrier database problem — Patterdale and Border Terrier are genetically close enough that a smaller reference panel will flip between them depending on how the algorithm is weighted that day. Jack Russell coming up on both tests is probably accurate; it's the secondary breed where the confidence is low. To settle this properly, you need a test with a significantly larger SNP panel and a much bigger reference population. Can I ask — did either previous test give you a percentage breakdown with confidence intervals, or just a flat breed list?

That explains a lot. The supermarket test almost certainly has a thin reference database — those tend to be rebranded low-tier kits. Wisdom Panel is decent but their breed detection for terriers specifically has historically been weaker than their competitor. The one I'd point you to for the most accurate result, especially for a terrier mix with conflicting prior results, is Embark. They analyse around 230,000 genetic markers compared to Wisdom Panel's roughly 1,800 — it's not even close in terms of resolution. Their terrier breed library is broader, and crucially they give you percentage breakdowns with relative confidence, so you'll actually be able to see how certain the result is. It also includes a solid health panel covering over 250 genetic conditions, which is a meaningful bonus even if it's not your main goal. The Embark Breed + Health kit is available on Amazon UK and is the test I'd confidently recommend here.

It's a fair challenge, and honestly the marketing in this space is loud. But the SNP count difference is real and independently documented — Embark was developed in partnership with Cornell University's College of Veterinary Medicine, and their peer-reviewed breed detection accuracy studies back up the higher resolution claims. For terriers in particular, the reason it matters is that many British terrier breeds were developed in geographic isolation and have subtle genetic signatures that only resolve clearly with a high-density marker panel. Embark has also been actively expanding their UK breed reference population, which is directly relevant for Patterdale, Border, and Lakeland types that are underrepresented in US-centric databases. You may still get a result that shows some ambiguity — that's honest science — but you'll get percentage breakdowns and confidence data rather than a flat guess.

Yes — a couple of things that genuinely affect result quality. Don't let her eat, drink, or mouth any toys or chews for at least two hours before you swab, ideally longer. You're collecting cheek cells and any food debris or saliva contamination from other sources dilutes the sample. Swab firmly against the inside of the cheek — not the teeth — and rotate as you go for a full 30 seconds per side. Let the swab air dry for about five minutes before sealing it in the tube, which helps preserve the DNA during transit. Results typically come back in three to four weeks. Given she's six and a complete mystery, I suspect you'll find the Embark result noticeably more detailed and confident than what you've seen before.