| 341 | Skye Terrier | Group 3 Terriers |
| 342 | Sloughi (Arabian Greyhound) | Group 10 Sighthounds (Windhounds) |
| 343 | Slovakian Chuvach | Group 1 Sheepdogs and Cattledogs |
| 344 | Slovakian Hound | Group 6 Scent hounds and related breeds |
| 345 | Wire-haired Slovakian Pointer | Group 7 Pointers |
| 346 | Smalands Hound | Group 6 Scent hounds and related breeds |
| 347 | Small Blue Gascony Hound | Group 6 Scent hounds and related breeds |
| 348 | Small Swiss Hound | Group 6 Scent hounds and related breeds |
| 349 | Collie Smooth | Group 1 Sheepdogs and Cattledogs |
| 350 | Soft-Coated Wheaten Terrier | Group 3 Terriers |
| 351 | South Russian Shepherd | Group 1 Sheepdogs and Cattledogs |
| 352 | Spanish Greyhound | Group 10 Sighthounds (Windhounds) |
| 353 | Spanish Mastiff | Group 2 Pinschers, Schnauzers, Mastiffs and Swiss mountain & cattledogs |
| 354 | Spanish Waterdog | Group 8 Retrievers, Water Dogs and Flushing Dogs |
| 355 | Spinone Italiano | Group 7 Pointers |
| 356 | St. Bernard dog | Group 2 Pinschers, Schnauzers, Mastiffs and Swiss mountain & cattledogs |
| 357 | Stabyhoun (Frisian Pointing Dog) | Group 7 Pointers |
| 358 | Staffordshire Bull Terrier | Group 3 Terriers |
| 359 | Coarse-haired Styrian Hound | Group 6 Scent hounds and related breeds |
| 360 | Sussex Spaniel | Group 8 Retrievers, Water Dogs and Flushing Dogs |