| augapfel | 1 | 2 |
| augenfremdkoerper | 1 | 1 |
| augenfremdkörper | 1 | 1 |
| augenwurm | 1 | 2 |
| august | 14 | 27 |
| ausland | 1 | 2 |
| äussere | 1 | 1 |
| australian | 5 | 5 |
| australian-cattledog-mischling | 1 | 1 |
| ayleen | 1 | 1 |
| babesiose | 2 | 3 |
| babette | 1 | 1 |
| backentaschenprolaps | 1 | 2 |
| baenzart | 2 | 2 |
| baghira | 1 | 1 |
| bagus | 1 | 1 |
| bailey | 1 | 1 |
| baileys | 1 | 1 |
| balou | 1 | 1 |
| balu | 1 | 1 |