- Stella
- Shay
- Sawyer
- Seymour
- Summit
- Seamus
- Sweetie
- Stevie
- Sparky
- Sissy
- Sam / Sammy / Samuel
- Skippy
- Snow
- Scooter
- Sprout
- Sweet Pea
- Snowflake
- Smalls
- Saint
- Smudge
- Sonny
- Solo
- Sherman
- Summer
- Spunky
- Socks
- Sergeant
- Stone
- Spirit
- Silver
- Stryker
- Snoopy
- Scamp
- Stewie
- Scotty
- Shep
- Sookie
- Saber
- Sora
- Silas
- Scooby
- Sosa
- Selena
- Simba
- Sox
- Scotch
- Sonic
- Sasha
- Sullivan
- Serenity
- Sebastian
- Sirius
- Scrappy
- Suki
- Shane
- Suzy
- Slinky
- Star
- Spot
- Shiner
- Sage
- Steve
- Sparkle
- Sitka
- Sophie
- Shadow
- Stormy
- Sprocket
- Sven
- Simon
- Sable
- Salem
- Spanky
- Stark
- Sansa
- Shelly
- Spencer
- Sally
- Shyla
- Skittles
- Scarlett
- Spock
- Scruffy
- Skip
- Susie
- Sprinkles
- Sofia
- Shaggy
- Snoop
- Stanley
- Snowball
- Sedona
- Samantha
- Sierra
- Shady
- Spooky
- Saki
- Sky / Skye
- Sumo
- Snickers
- Sapphire
- Sheila
- Strider
- Skipper
- Sandy
- Sequoia
- Stan
- Scully
- Sophia
- Shasta
- Solomon
- Sancho
- Skylar / Skyler
- Sol
- Shiloh
- Sid
- Sheldon
- Seven
- Sugar
- Shelby
- Savannah
- Sheba
- Spartacus
- Smokey
- Sunny
- Sarge
- Simone
- Schatzi
- Sunshine
- Stuart
- Sienna
- Shea
- Sparkles
- Sterling
- Spice
- Shorty
- Spud
- Sarah
- Sailor
- Scout
- Spike
- Sully
- Storm / Stormy
- Stitch
- Snuggles
- Sara
- Shanti
- Squirt
- Snowy
- Sabrina
- Sadie
- Samson / Sampson
- Shiva
- Sassy
- Stout
- Sherlock
- Sushi
- Shirley
- Skeeter
- Sydney / Sidney
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