| Abbreviation | Definition |
|---|---|
| RBST | Rare Breeds Survival Trust |
| rBST | Recombinant Bovine SomatoTropin |
| RBT | Royal Bengal Tiger |
| RCD | Rabbit Calicivirus Disease |
| RCO | Russian Carnivorous Octopi |
| RCP | Regional Collection Plan |
| RCP | Registry of Comparative Pathology (defunct) |
| RCV | Rabbit Calicivirus |
| RCVS | Royal College of Veterinary Surgeons |
| RD | Rat Dog |
| RD | Rescued Dog |
| RDA | Riding for the Disabled Association |
| RDS | Research Defence Society |
| RDS | Rural Development Service |
| RER | Resting Energy Rate |
| REVA | Russian Equine Veterinary Association |
| RFH | Random Feline Hygene |
| RGT | Retired Greyhound Trust |
| RHASS | Royal Highland and Agricultural Society of Scotland |
| RIC | Rabbit Industry Council (USA) |