Spain10-12 yr lifespan

The Spanish Mastiff is a giant Spanish livestock guardian, traditionally used to protect flocks during transhumance across open country.

Spain12-14 yr lifespan

The Spanish Water Dog is a medium Spanish working breed with a rustic curly corded coat, herding background, and strong drive for active work.

The Stabyhoun is a medium Dutch multipurpose farm and gundog from Friesland, known for a black-and-white coat, steady nature, and close family bond.

The Staffordshire Bull Terrier is a compact British terrier with a muscular build, short coat, affectionate family nature, and confident temperament.

The Sussex Spaniel is a low, heavy British spaniel with a rich golden-liver coat, deliberate hunting style, and affectionate but sometimes stubborn nature.

Sweden12-14 yr lifespan

The Swedish Lapphund is a medium Nordic spitz from Sweden, historically associated with Sami reindeer work, with a black weather-resistant coat and lively voice.

Sweden12-15 yr lifespan

The Swedish Vallhund is a small Swedish cattle-herding spitz with a long body, short legs, wolf-gray coat, and bold working attitude.

Switzerland11-14 yr lifespan

The Swiss Hound is a medium Swiss scenthound family with four traditional varieties, known for endurance, voice, and focused tracking work.

The Taiwan Dog is a medium primitive hunting and companion breed from Taiwan, known for agility, loyalty, alertness, and a short tight coat.

The Tatra Hound is a small Slovak scenthound with a long body, strong trail drive, and black-and-tan or red coat varieties.

United States14-16 yr lifespan

The Teddy Roosevelt Terrier is a short-legged American farm terrier descended from Rat Terrier type dogs, with a lively, affectionate, and vermin-hunting nature.

Thailand11-14 yr lifespan

The Thai Bangkaew Dog is a medium Thai spitz from Phitsanulok, known for a thick double coat, strong watchdog instinct, and loyal but wary temperament.