| Abbreviation | Definition |
|---|---|
| SM | Snooker Master |
| SOB | Stumble On Bird |
| SODA | Serve Our Dog Areas |
| SOHF | Society of Humane Friends |
| SOSD | Salty Old Sea Dogs |
| SOSD | Save Our Small DOGS |
| SOSD | Save Our Street Dog |
| SPDR | Seattle Purebred Dog Rescue |
| SR | Southern Retrievers dog training facility in Central Florida |
| SR | Started Retriever |
| SSBA | Shiloh Shepherd Breed Association |
| SSD | Special Skills Dog |
| SSDCA | Shiloh Shepherd Dog Club of America |
| SSDR | Saints Sled Dog Rescue |
| SSDW | Self Service Dog Wash |
| SSPK | Suomen Snautseri-PinserikesKusjärjestö |
| SSPK | Svenska Schnauzer Pinscherklubben |
| STCA | Scottish Terrier Club of America |
| STCA | Silky Terrier Club of America |
| STD | Started Trial Dog |