| Abbreviation | Definition |
|---|---|
| HRAH | Hamilton Ridge Animal Hospital |
| HRAH | Hart Road Animal Hospital |
| HRAH | Highland Road Animal Hospital |
| HRAH | Hudson Road Animal Hospital |
| HSAC | Help Stop Animal Cruelty |
| HSAM | Help the Street Animals of Morocco |
| HSAR | Hull Seaside Animal Rescue |
| HSPCA | Houston Society for the Prevention of Cruelty to Animals |
| HSPCA | Humane Society for the Prevention of Cruelty to Animals |
| HSTAIC | Harry S. Truman Animal Import Center (USDA) |
| HTA | Help The Animals |
| HTAR | Happy Tails Animal Rescue |
| HVAA | Hidden Valley Animal Adventure |
| IAAAM | International Association for Aquatic Animal Medicine |
| IAAC | Internal Amplification and Animal Control |
| IAAM | Invasive Aspergillosis Animal Models |
| IAASA | I am a stuffed animal |
| IAAT | International Association of Animal Therapists |
| IACUC | institutional animal care and use |
| IACUC | Institutional Animal Care and Use Comittee |