| 381 | Weimaraner | Group 7 Pointers |
| 382 | Welsh Corgi Cardigan | Group 1 Sheepdogs and Cattledogs |
| 383 | Welsh Corgi Pembroke | Group 1 Sheepdogs and Cattledogs |
| 384 | Welsh Springer Spaniel | Group 8 Retrievers, Water Dogs and Flushing Dogs |
| 385 | Welsh Terrier | Group 3 Terriers |
| 386 | West Highland White Terrier | Group 3 Terriers |
| 387 | West-Siberian Laïka | Group 5 Primitive type dogs and Spitzes |
| 388 | Westfal Terrier | Group 3 Terriers |
| 389 | Westphalian Dachsbracke (Westfälische Dachsbracke) | Group 6 Scent hounds and related breeds |
| 390 | Wetterhoun (Frisian Water Dog) | Group 7 Pointers |
| 391 | Whippet | Group 10 Sighthounds (Windhounds) |
| 392 | White English Bulldog | Group 2 Pinschers, Schnauzers, Mastiffs and Swiss mountain & cattledogs |
| 393 | White Swiss Shepherd | Group 1 Sheepdogs and Cattledogs |
| 394 | Wire-haired Pointing Griffon Korthals | Group 7 Pointers |
| 395 | Xoloitzcuintle, Mexican Hairless Dog | Group 5 Primitive type dogs and Spitzes |
| 396 | Yakutian Laika | Not categorized by FCI |
| 397 | Yorkshire terrier | Group 3 Terriers |
| 398 | Irish Red and White Setter | Group 7 Pointers |
| 399 | Bouvier des Ardennes | Group 1 Sheepdogs and Cattledogs |
| 400 | Fila Brasileiro | Group 2 Pinschers, Schnauzers, Mastiffs and Swiss mountain & cattledogs |