Scarred skin
Scoliosis, lateral deviation of back
Second degree atrioventricular heart block
Seizures or syncope, convulsions, fits, collapse
Sinus arrest
Sinus arrhythmia
Sinus tachycardia
Skin crusts, scabs
Skin edema
Skin erythema, inflammation, redness
Skin fistula, sinus
Skin hyperpigmentation, excess pigment
Skin hypopigmentation, decreased pigment, vitiligo
Skin laceration, cut, tear, bite
Skin necrosis, sloughing, gangrene
Skin or muscle dimple, depression, indentation
Skin pain
Skin papules
Skin plaque
Skin pustules
Skin scales, flakes, peeling
Skin ulcer, erosion, excoriation
Skin vesicles, bullae, blisters
Skin wheal, welt
Slough of mammary gland, udder
Small litter size
Sneezing, sneeze
Soft, thin egg shell
Soiling of the feathers, vent feathers
Soiling of the vent in birds
Spasms of the limbs, legs, foot, feet in birds
Splitting nail, claw, hoof, breaking, brittle, cracked
Steatorrhea, fatty stools, feces
Stiffness or extended neck
Strabismus
Subcutaneous crepitation, skin emphysema
Sudden death, found dead
Sunken, empty crop in birds
Supernumerary opening of nasolacrimal duct
Supernumerary, extra teats
Sweating excessively, hyperhidrosis
Swelling mass anus rectum
Swelling mass cervix uteri
Swelling mass enlarged prostate
Swelling mass ovary
Swelling mass oviducts
Swelling mass penis, prepuce, testes, scrotum
Swelling mass uterus
Swelling mass vagina
Swelling mass, vulva, clitoris
Swelling of the beak
Swelling of the comb, wattles in birds
Swelling of the limbs, legs, foot, feet, in birds
Swelling of the snood, frontal process, in turkeys
Swelling skin or subcutaneous, mass, lump, nodule
Swelling, mass external abdomen
Swelling, mass tail
Swelling, mass, prolapse, cloaca
Swelling, mass, wing
Syndactyly
Synechia
Systolic click