| Name | Meaning | Gender | Origin |
|---|
| Rascal | One that is playfully mischievous | Unisex | English |
| Rogue | | Unisex | Hebrew |
| Roo | | Unisex | Hebrew |
| Rusty | Rusty, full of rust | Unisex | American English |
| Sable | Sable (black) | Unisex | English |
| Sabre | | Unisex | Hebrew |
| Sammy | His name is God | Unisex | Hebrew |
| Sasha | Defending men | Unisex | Greek |
| Sassy | Lively and spirited | Unisex | English |
| Satan | The Devil and adversary of God | Unisex | English |
| Scout | Observer | Unisex | American English |
| Shadow | Shadow | Unisex | English |
| Shorty | Of less than average size | Unisex | English |
| Skinny | | Unisex | Hebrew |
| Slim | Slender in proportion to height. | Unisex | English |
| Smoky | | Unisex | Hebrew |
| Sparky | Animated, lively. | Unisex | English |
| Spider | An eight legged insect | Unisex | English |
| Squeek | | Unisex | Hebrew |
| Squirt | Slang for a small person | Unisex | English |
| Stumpy | A short, thickset person | Unisex | English |
| Taz | Wild Animal, Thrid Born | Unisex | American |
| Tink | | Unisex | Hebrew |
| Tinkerbelle | Named after the fairy... Peter Pan's little sidekick! | Unisex | English |
| Tiny | Extremely small | Unisex | English |
| Toby | God is good | Unisex | Hebrew |
| Trooper | A state or mounted police officer. Also a member of a cavalry unit. | Unisex | English |
| Trouble | A cause of disturbance or difficulty. | Unisex | English |
| Turbo | Driven by a turbine - turbocharged | Unisex | English |
| Twiggy | | Unisex | Hebrew |