| Abbreviation | Definition |
|---|---|
| SLVA | Sri Lanka Veterinary Association |
| SLVS | Sugar Land Veterinary Specialists |
| SMBB | Sand Mountain Blue Butterfly |
| SMR | Suppression of Mite Reproduction |
| SMRU | Sea Mammal Research Unit (St Andrews University) |
| SNOAPAD | Standard Nomenclature of Animal Parasites and Diseases |
| SNVEL | Syndicat National des Veterinaires d'Exercice Liberal (French Veterinary Association) |
| SOA | Save Our Animals |
| SOAEFD | Scottish Office Agriculture, Environment and Fisheries Department |
| SOAS | Spider Of Abnormal Size |
| SOP | Sociedad Ornitológica Puertorriqueña |
| SOP | Society Of Protozoologists |
| SOT | Society Of Toxicology |
| SPANA | Society for the Protection of Animals Abroad |
| SPARKS | Single Population Animal Records Keeping Software |
| SPCA | Society For The Prevention Of Cruelty To Animals |
| SPD | Symphis Pubic Dysfunction |
| SPIN | Special Pet In Need |
| SPL | Sub-Palpebral Lavage |
| SPT | Start Puppy Training |