~ O ~
| O'Brien | O'Henry | O'Leary | O'Malley | O'Rourke | Oats | Obadiah |
| Obie | Oblio | Oblong | Obsession | Ocelet | Ode | Odel |
| Odessa | Odessey | Odette | Odie | Offbeat | Oh Boy | Oh No |
| Ol' Man | Olaf | Old Timer | Old Yeller | Oleander | Olin | Olive Oyl |
| Oliver | Olivia | Ollie | Omar | Omega | Omelet | Omen |
| Omnibus | One Step | Oneway | Onna | Onyx | Oodles | Opal |
| Ophelia | Opus | Oracle | Orbit | Orca | Orchid | Oren |
| Oreo | Orion | Orleans | Ornery | Orphan | Orson | Orville |
| Osaka | Osborn | Oscar | Osgood | Oshkosh | Osiris | Oswald |
| Oswell | Otis | Otter | Otto | Otz | Oui | Owen |
| Oxford | Oz | Ozymandias | Ozzie |
If you use any of the above names, please email me, and let me know which name that you chose and what type of pet you've named!
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