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Curly Coated

All the above mentioned have been derived directly or from dogs imported ; but there is one which may for convenience be counted as of the foundation, although she never was claimed to be a Labrador. Lord Grimston, afterwards third Earl of Verulam, son-in-law of Sir Frederick Graham, procured Kielder, 1872 probably in 1879, and mated him with his Susan. The progeny were called Labradors, and Lord Grimston inbred incestuously to these for several generations. From this it is evident that Lord Grimston's Labrador Kennel of Labradors was originally only half bred. Sir Richard Graham, brother-in-law to Lord Grimston, described Susan as having " No pedigree so far as I know. She was a small black curly-coated good retriever : the sort that has completely died out.'' She, however, had a pedigree of a kind.
Although not a Labrador, Susan appears occasionally in almost every pedigree of a Labrador retriever, and were it not for Susan the strain of Netherby Kielder 1872 would not exist now. The list as shown above comprises all those directly descended from the imported dogs to which present-day Labradors can be traced, and are the foundations of the breed in Great Britain.
https://dai.mun.ca/PDFs/cns/TheLabradorDogItsHomeAndHistory.pdf