| 321 | Saluki | Group 10 Sighthounds (Windhounds) |
| 322 | Samoyed | Group 5 Primitive type dogs and Spitzes |
| 323 | Yugoslavian Shepherd Dog-Sharplanina (Sarplaninac) | Group 2 Pinschers, Schnauzers, Mastiffs and Swiss mountain & cattledogs |
| 324 | Schiller Hound (Schillerstövare) | Group 6 Scent hounds and related breeds |
| 325 | Schipperke | Group 1 Sheepdogs and Cattledogs |
| 326 | Schnauzer | Group 2 Pinschers, Schnauzers, Mastiffs and Swiss mountain & cattledogs |
| 327 | Scottish Terrier | Group 3 Terriers |
| 328 | Sealyham Terrier | Group 3 Terriers |
| 329 | Serbian Hound | Group 6 Scent hounds and related breeds |
| 330 | Serbian Tricolour Hound | Group 6 Scent hounds and related breeds |
| 331 | Shar Pei, Chinese Shar-Pei | Group 2 Pinschers, Schnauzers, Mastiffs and Swiss mountain & cattledogs |
| 332 | Shetland Sheepdog | Group 1 Sheepdogs and Cattledogs |
| 333 | Shiba Inu | Group 5 Primitive type dogs and Spitzes |
| 334 | Shih Tzu | Group 9 Companions and Toys |
| 335 | Shih-Poo | Group 9 Companions and Toys |
| 336 | Shikoku | Group 5 Primitive type dogs and Spitzes |
| 337 | Shiloh Shepherd | Group 5 Primitive type dogs and Spitzes |
| 338 | Siberian Husky | Group 5 Primitive type dogs and Spitzes |
| 339 | Sicilian Sheepdog | Group 1 Sheepdogs and Cattledogs |
| 340 | Silken Windhound | Group 6 Scent hounds and related breeds |