Различать "шоу" британцы, а рабочие - американцы - это неправильно.

У британцев полно рабочих собак.

Шоу собак единицы.

По экстерьеру различать, кто шоу, а кто рабочий, потому что- длинноноги - так это не делается.

Американцы нервно курят в сторонке

https://www.tallgrasskennels.com/british-labradors

https://www.workingmangundogs.com/

https://www.southernoakkennels.com/why-british-labradors/

Нельзя не согласиться:

The differences in the training cultures, which sometimes exist between the U.S. and the U.K., have resulted in labrador gene pools that can produce retrievers with different characteristics.

Generally speaking, there is less “force” involved in the training methodologies found in the U.K. To our knowledge, electronic collar based programs and force fetching procedures are very rarely utilized in the U.K., whereas in the U.S. they are standard practices. These differing approaches to developing dogs, resulted in quite different emphases being placed on breeding decisions. That, in turn, resulted in some of the differences we see manifested in the dogs from these two different regions of the world.

A labrador from the U.K. is generally a quieter, softer natured, soft mouthed dog, while a labrador from the U.S. field trial lines tends to be a dog who can better handle more of the mental and physical pressure that is so often a part of the training process in the U.S.