| Abbreviation | Definition |
|---|---|
| A | Ape |
| AAALAC | Association for Assessment and Accreditation for Laboratory Animal Care |
| AAALAC | Association for Assessment and Accreditation of Laboratory Animal Care |
| AAAP | Australasian Association of Animal Production |
| AABP | Association of Animal Behavior Professionals |
| AACCC | Anchorage Animal Care And Control Center |
| AACOC | Animal Assisted Counseling of Colorado |
| AACR | Animal-Assisted Crisis Response |
| AAE | Animal Assisted Education |
| AAEU | Aquatic Animal Experiment Unit |
| AAF | Animal Adoption Foundation |
| AAF | Animal Assistance Foundation |
| AAFCO | American Animal Feed Control Organization |
| AAGS | Animal Alliance of Greater Syracuse |
| AAH | Animal Assisted Happiness |
| AAHA | Adopt a Homeless Animal |
| AAHA | American Animal Hospital Association |
| AAHC | Acacia Animal Health Center |
| AAHC | Agriculture and Animal Husbandry Corporation |
| AAHC | Agriculture Animal Husbandry Corporation |