Saba

Sabastian

Sabbath

Saber

Saber-tooth

Sable

Sabrina

Saddam

Safari

Saffron

Saga

Sage

Sailor

Sake

Salamander

Salsa

Salty

Salvatore

Sam

Sambuca

Sambuddha

Sam-i-am

Samiran

Sammy

Samoa

Samsara

Samurai

Sananda

Sancha

Sandman

Sangria

Santa Fe

Santano

Santini

Santo

Sapan

Saphyr

Sapphire

Saprkle

Sara

Sarasota

Sarge

Sas

Sasha

Sashimi

Sasquatch

Sassafras

Sassy

Satay

Satchmo

Satin

Sauce or Saucy

Sausage

Sausy

Savage

Savana

Savannah

Savernake

Savir

Savita

Savoy

Scampi

Scarborough

Scarlet

Schatze

Scheherezade

Schmoo

Schmooze

Schnapps

Schooner

Schwarzkopf

Schweppes

Scintilla

Scoobie

Scooby

Scooter

Scorpio

Scotch

Scott

Scotty

Scoundrel

Scout

Scrappy Too

Scratch

Scrooge

Scruffy

Scrumptious

Scuba

Scud

Scylla

Sea Dog

Seabreeze

Seal

Seamus

Seana

Seb

Sedona

Selma

Seneca

Sephira

Sera

Serena

Serenade

Serendipity

Serengeti

Sergeant

Seuss

Sevati

Seychelles

Seymour

Shadow

Shaggy

Shah

Shakespeare

Shakira

Shalimar

Shama

Shameena

Shamrock

Shamu

Shana

Shandi

Shane

Shangri-la

Shania

Shanta

Shantay

Shanti

Shardul

Sharkey

Sharmila

Sharp

Shawnee

Sheba

She-devil

Sheena

Sheer

Sheik

Shelby

Shelley

Shenanigans

She-rap

Sheriff

Sherlock

Sherman

Sherwood

Shiitake

Shiksa

Shing

Shiro

Shiva

Shoeless

Shogun

Shooter

Shorty, Shortcake

Shotgun

Showoff

Shramsberg

Shrapnel

Shredder

Shreshta

Shrimp

Shuggs

Shylock

Siciliano

Sideways

Sidney

Siegfried

Sienna

Sierra

Sigma

Sigmund

Silhouette

Silky

Silver

Silverspoon

Simba

Simply Red

Sin

Sinaia

Sinatra

Sinbad

Sinclair

Singer

Siri

Sirius

Si-si

Sissy

Sitting Bull

Six Toes

Skedaddle

Skeeder

Skeeter

Skidder

Skipper

Skippy

Skittles

Sky

Sky

Sky Hawk

Skydiver

Skyrocket

Skywalker

Slate

Sleestack

Slick

Slicker

Slippers

Slobber-puss

Sloth

Slugger

Sly

Smasher

Smita

Smitty

Smokey

Smoocher

Smores

Snack Pac

Snaggletooth

Snaker

Snap

Snarl

Sneakers

Sneezy

Snickers

Snickers

Sniffer

Sniffles

Snifter

Snocap

Snoogybear

Snooker

Snooks

Snookums

Snooper

Snoopy

Snooty

Sno-pea

Snorter

Snow Biz

Snow, Snowball, Snowflake

Snowberry

Snowbunny

Snowman

Snuffles

Snuggles, Snuggle-puss

Socks

Socrates

Sohini

Soleil

Solo

Solomon

Solstice

Sonata

Sonia

Sooner

Sophie

Sorbet

Sorcerer or Sorceress

Sorrel

Soso

Soueee

Sourdough

Southern Comfort

Southpaw

Spades

Spaghetti

Spago

Spam

Spanky

Sparkey

Sparkey or Sparkle

Sparkplug

Sparky

Sparrow

Specs

Spectra

Speedwagon

Speedy

Spellbinder

Spencer

Sphinx

Spice

Spicy

Spider

Spike

Spinner

Spirit

Spirit

Spitfire

Splash

Splash

Spock

Spooky

Sport

Spot

Spotty

Sprightly

Spring

Sprinkles

Sprint

Sprite

Sprite

Spuds

Spumanti

Spunky

Sputnik

Spy

Spyro

Squat

Squeaky

Squeeky

Squid

Squirt

Star

Stardust or Starlight

Stargazer

Starlet

Stella

Stellar

Sterling

Stetson

Sting

Stinker or Stinker Belle

Stinky