 | SaarlooswolfhondHeight: 24-29 inches Weight: 79-90 pounds |
 | Saint Berdoodle (h)Height: 24-30 inches Weight: 110-200 pounds |
 | Saint BernardHeight: 25 – 28 inches Weight: 110 – 200 pounds |
 | Saint Dane (h)Height: Weight: |
 | SalukiHeight: 23-28 inches Weight: 29-66 pounds |
 | SamoyedHeight: 21 – 24 inches Weight: 45 – 65 pounds |
 | SarplaninacHeight: 22-24 inches Weight: 55-80 pounds |
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 | SchipperkeHeight: 10-13 inches Weight: 12-18 pounds |
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 | Schnoodle (h)Height: 10-20 inches Weight: 8-75 pounds |
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 | Scottish Cocker (h)Height: Weight: |
 | Scottish DeerhoundHeight: 28-32 inches Weight: 75-110 pounds |
 | Scottish TerrierHeight: 10-11 inches Weight: 19-23 pounds |
 | Scottish-Skye Terrier (h)Height: Weight: |
 | Sealyham TerrierHeight: 12 inches Weight: 20 pounds |
 | Shairn-Inu (h)Height: Weight: |
 | Shar PeiHeight: 18 – 20 inches Weight: 40 – 55 pounds |
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 | Shetland SheepdogHeight: 13-16 inches Weight: 14-27 pounds |
 | Shi-Pom (h)Height: Weight: |
 | Shiba InuHeight: 13-16 inches Weight: 18-30 pounds |
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 | Shichon (h)Height: 9-12 inches Weight: 7-12 pounds |
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 | Shih TzuHeight: 11 inches Weight: 9 – 16 pounds |
 | Shih-Mo (h)Height: Weight: |
 | ShihPoo (h)Height: 10-15 inches Weight: 5-15 pounds |
 | ShikokuHeight: 7-21 inches Weight: 35-50 pounds |
 | Shiloh ShepherdHeight: 28-30 inches Weight: 80-130 pounds |
 | Shinese (h)Height: Weight: |
 | Shiranian (h)Height: 7-12 inches Weight: 4-16 pounds |
 | Shocker (h)Height: Weight: |
 | Shorgi (h)Height: Weight: |
 | Shorkie (h)Height: 6-11 inches Weight: 7-16 pounds |
 | Shug (h)Height: Weight: |
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 | Siberian HuskyHeight: 20 – 24 inches Weight: 35 – 60 pounds |
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 | Silken WindhoundHeight: 18-23 inches Weight: 22-55 pounds |
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 | Silky TerrierHeight: 9-10 inches Weight: 8-11 pounds |
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 | Skip-Shzu (h)Height: Weight: |
 | Skye TerrierHeight: 10 inches Weight: 25 pounds |
 | Skypoo (h)Height: Weight: |
 | SloughiHeight: 24-28 inches Weight: 35-65 pounds |
 | Slovensky CuvacHeight: 22-28 inches Weight: 66-99 pounds |
 | Smooth Fox TerrierHeight: 13-16 inches Weight: 13-20 pounds |
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 | Soft Coated Golden (h)Height: Weight: |
 | Soft Coated Wheaten TerrierHeight: 17-20 inches Weight: 30-45 pounds |
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 | Soft Coated Woxer (h)Height: Weight: |
 | South Russian OvtcharkaHeight: 24-25 inches Weight: 108-110 pounds |
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 | Spanish MastiffHeight: 28-35 inches Weight: 145-220 pounds |
 | Spanish Water DogHeight: 16-20 inches Weight: 30-49 pounds |
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 | Spinone ItalianoHeight: 22-27 inches Weight: 61-85 pounds |
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 | St Weiler (h)Height: Weight: |
 | StabyhounHeight: 19-21 inches Weight: 40-55 pounds |
 | Staffordshire Bull TerrierHeight: 13-16 inches Weight: 23-38 pounds |
 | Standard PoodleHeight: 15 - 25 inches Weight: 45 – 70 pounds |
 | Standard SchnauzerHeight: 17-20 inches Weight: 30-45 pounds |
 | Sussex SpanielHeight: 15-16 inches Weight: 40-44 pounds |
 | Swedish VallhundHeight: 12-16 inches Weight: 25-35 pounds |
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