Sabella

Sable

Sabra

Sacco

Sadie

Sadie Belle

Saffron

Sage

Sahib

Saint

Sak Da

Saki

Salamaller

Salem

Salernia

Sallie

Salome

Salsa

Salt

Salty

Samba

Sambuca

Sami

Samitha

Samori

Sanders

Sandie

Sandrine

Sangievese

Santa

Santa's Little Helper

Santi

Saphi

Sapling

Sappho

Sarabeth

Sarah, Plain and Tall

Sarina

Sarsaparilla

Saru

Sascha

Sasha

Sasquach

Sasquatch

Sassafras

Sassette

Sassy

Sati

Satin

Saturn

Saucey

Sauvage

Scabbie

Scamp

Scamper

Scampi

Scardey

Scaredy

Scaredy Cat

Schnee

Schnitzel

Schnitzy

Schooner

Schrodinger

Scissors

Sco

Scone

Scooter

Scooter Pie

Scotch & Soda

Scout

Scrappy

Scratch

Scrawny

Scrawny Cat

Screamer

Screech

Screwtop

Scruff

Scruffy

Scudder

Scully

Scuma

Scuzzface

Seanna

Seetay

Seltzer

Seminole

Sepher

Sephie

Serai

Serenity

Set

Seven

Shada

Shadi

Shadow

Shady

Shaina

Shakes

Shakira

Sham

Shama

Shammy

Shamrocka

Shandy

Shanghi

Sharky

Sharni

Shasta

Shay

Shayna

Shaynala

Shaynie

Shaynmeister

Shazzam

Sheba

Sheeber

Sheera

Sherry

Shiloh

Shima

Shimi

Shimmer

Shine

Shino

Shirah

Shiraz

Shiriki

Shirin

Shish

Shiti

Shitakii

Shitani

Shitty Kitty

Shiva

Shmoo

Shoda

Shoobie

Shooger

Shortie

Shortstop

Shoshie

Shotzie

Shreen

Shuana

Shut Up

Shy

Siam

Siamsa

Sierra

Sigma

Silk

Silken

Silkers

Silkworth

Silky

Silly

Silver

Silvie

Simkin

Simpatica

Sin

Sine

Siren

Sissy

Sitsa

Siva

Sixer

Sjimmie

Skanky

Skeetie

Skeeter

Skittah

Skitter

Skittle

Skittles

Skor

Skoshi

Skrawny

Skunk

Skunky

Skweeter

Sky

Skylark

Skyler

Skymble

Sleek

Slick

Slickers

Slicks

Slim

Slinky

Slinx

Slither

Sly

Smitty

Smoka

Smoke

Smokey

Smokie

Smoky

Smoochers

Smoochie

Smoogee

Smorca

Smudge

Smurfette

Snaggle

Snakers

Snapshot

Sneakers

Sneaky

Snickers

Sniff

Snit

Snitch

Snook

Snooker

Snookie

Snookster

Snookums

Snooky

Snooky Wooky

Snooper

Snoopy

Snorky

Snorky Dorky

Snots

Snow

Snow Princess

Snow Queen

Snowball

Snowflake

Snowshoe

Snowstorm

Snowy

Snuggles

Socks

Soda

Sofa

So-Ho

Solie

Something

Sook

Soosh

Sooti

Sootica

Sootikin

Sooty

Sopher

Soran

Sorsha

Souki

Soul

Soup

Sox

Spacey

Spaette

Spaetzle

Spamela

Spanky

Spare Parts

Sparker

Sparkle

Sparky

Sparti

Spats

Spaz

Special

Speck

Specter

Spectra

Speed

Speedy

Spice

Spicecake

Spiff

Spiggy

Spinoza

Spirit

Spitfire

Spitsey

Spitz

Spitzette

Splash

Splat

Spliff

Splinter

Splotch

Splotches

Spokane

Spoofy

Spooge

Spook

Spookie

Spookins

Spooky

Spring

Sprinkale

Sprinkales

Sprite

Sprout

Spud

Spudnik

Spunkie

Spunkie Girl

Spunky

Spur

Sputnik

Sputz

Sputza

Squeak

Squeaker

Squeakers

Squeaky

Squeeks

Squeeky

Squeeler

Squidge

Squiffel

Squirm

Squirrel

Squirt

Squishy

Stache

Star

Starbuck

Starla

Starlight

Starsky

Stash

Stavanger

Stealth

Steinway

Stella

Stickie

Stimpy

Stinker

Stinky

Stitch

Stitchery

Stitches

Stolen

Stop That!

Stopper

Storm

Storm Cloud

Stormie

Stormy

Stranger

Strepe

Stress

Stretch

Stribe

Strider

Striker

Stripe

Striper

Stripey

Stubby

Stubie

Stump

Stumpy

Stupid

Suelie

Sugar

Sugar Bear

Sugar Magnolia

Sugarbear

Sugarfoot

Sugarplum

Sugarpuss

Sugie

Suibne

Suk

Suki

Suki Aki

Sulu

Sumatra

Sumi

Summer

Sun

Sun Ra

Sundance

Sunday

Sundown

Sunflower

Sunni

Sunny

Sunset

Sunshine

Sushi

Suzy Q

Sweep

Sweet

Sweet Pea

Sweet Pee

Sweet Tart

Sweetheart

Sweetie

Sweetie Bear

Sweetie Kitty

Sweetie Pie

Sweetikins

Swiss

Swoozie

Swoozie

Sylvie

Symba

Symphony

Sunburn