| 261 | Norfolk Terrier | Group 3 Terriers |
| 262 | Artesian-Norman Basset5 | Group 6 Scent hounds and related breeds |
| 263 | Norwegian Buhund | Group 5 Primitive type dogs and Spitzes |
| 264 | Norwegian Elkhound grey | Group 5 Primitive type dogs and Spitzes |
| 265 | Norwegian Hound | Group 6 Scent hounds and related breeds |
| 266 | Norwegian Lundehund | Group 5 Primitive type dogs and Spitzes |
| 267 | Norwich Terrier | Group 3 Terriers |
| 268 | Nova Scotia Duck Tolling Retriever | Group 8 Retrievers, Water Dogs and Flushing Dogs |
| 269 | Old Danish Pointer | Group 7 Pointers |
| 270 | Old English Sheepdog (Bobtail) | Group 1 Sheepdogs and Cattledogs |
| 271 | Old German Cattledog | Group 1 Sheepdogs and Cattledogs |
| 272 | Olde English Bulldogge | Group 2 Pinschers, Schnauzers, Mastiffs and Swiss mountain & cattledogs |
| 273 | Otterhound | Group 6 Scent hounds and related breeds |
| 274 | Papillon | Group 9 Companions and Toys |
| 275 | Parson Russell Terrier | Group 3 Terriers |
| 276 | Patterdale terrier | Group 3 Terriers |
| 277 | Pekingese | Group 9 Companions and Toys |
| 278 | Peruvian Hairless Dog | Group 5 Primitive type dogs and Spitzes |
| 279 | Petit Basset Griffon Vendeen | Group 6 Scent hounds and related breeds |
| 280 | Pharaoh Hound | Group 5 Primitive type dogs and Spitzes |