- Strudel
- Samuel
- Spalding
- Shiloh
- Seuss
- Spunky
- Sticky
- Syther
- Spanky
- Slug
- Spencer
- Shaker
- Shelby
- Snuffy
- Swamp
- Shorty
- Seven
- Sigmund
- Scardy
- Smokey
- Statler
- Sheriff
- Shaggy
- Sonny
- Shonen
- Steve
- Seymour
- Sherman
- Stetson
- Sultan
- Sambuca
- Snickers
- Stinker
- Sudz
- Snoopy
- Satchmo
- Semper Fi
- Sparky
- Sharpe
- Sire
- Spud
- Smitty
- Syxx
- Sake
- Sleepy
- Sergeant
- Sarge
- Styles
- Serpico
- Socrates
- Shakespeare
- Spike
- Scamper
- Soprano
- Samson
- Sam
- Sting
- Sergei
- Sean
- Soto
- Sport
- Spazz
- Saber
- Slater
- Stray
- Shane
- Socks
- Sheldon
- Skipper
- Silver
- Shaw
- Shamus
- Simon
- Sushi
- Sidney
- Stubby
- Scrubby
- Solo
- Stryker
- Shep
- Soldier
- Scruffy
- Scooby
- Switchblade
- Spider
- Scrappy
- Stanley
- Strider
- Savoy
- Sully
- Schwartz
- Scud
- Skank
- Scout
- Stain
- Sabastian
- Scooter
- Sooner
- Soda
- Sheik
- Solomon
- Stollen
- Sawyer
- Spam
- Shotzie
- Sox
- Squall
- Schnapps
- Stavros
- Soren
- Scotch
- Salem
- Snooper
- Stewart
- Sportster
- Spago
- Syrus
- Speedy
- Skeeter
- Sony