However, as it may help others: https://www.sciencedirect.com/science/article/pii/S1090023315004578
A very thorough analysis, which details that 16% of guide dogs have to retire early due to muscular skeletal issues such as dysplasia. That's a huge amount. This was, of course, as of 9 years ago. What's more of a worry is and the gene pool, COI if both labs and Goldies has actually become smaller since then, so it's probably higher now (realistically)
https://eprints.nottingham.ac.uk/33252/1/Daisy%20Jones%20MRes%20Thesis%204252846.pdf
This also demonstrates that they screen the dogs in their breeding programme too early for many health issues (particularly dysplasia).They screen then between 11-12 months (Guide Dogs Association are cited as having provided this information).,
Unfortunately, as any retriever owner knows, they're not done growing then...so the plates/bones/joints shift and change. By screening them younger, they can claim their dogs are healthier. If they waited until the dogs were fully grown, they would have higher scores. The BVA actually says you shouldn't really test your dogs before 24 months for that exact reason.
Guide dogs will also breed any dogs where the score is 'median' for the breed. Which in theory, is fine. But as I just noted above. If a dog is showing as 'breed median scores' at 12 months...it's almost certainly going to get worse as they continue to grow, isn't it? And screening that early is against BVA advice.
And Median for the breed is still astronomically high - for Goldies that's 17. And I wouldn't be comfortable buying a puppy from parents that had scores higher than 10.
So, they might be testing...but they're testing at the point where they are likely to get the best scores rather than testing when the dog is fully mature.