This list includes 10 Pets and domestic animals that start with O, from “Ocicat” to “Ox”. They range from small companion species to large working animals and serve roles in companionship, education, and small-scale husbandry.
Pets and domestic animals that start with O are species people keep for companionship, food, work, or exhibition. For example, the Ocicat looks wild but is a fully domestic breed developed in the 1960s.
Below you’ll find the table with Common name, Scientific name, Size (cm), and Classification.
Common name: The everyday name you use to identify each animal, so you can find and recognize familiar pets quickly.
Scientific name: The Latin binomial that lets you look up the exact species and compare information across sources.
Size (cm): Typical adult length or height in centimeters, giving you a quick sense of how large the animal usually is.
Classification: Broad group such as Mammal, Bird, Reptile, Fish, or Arthropod to help you sort animals by type and care needs.
Pets and domestic animals that start with O
| Name | Scientific name | Typical adult size (cm) | Classification | Description |
|---|---|---|---|---|
| Ox | Bos taurus | 140–170 cm | Mammal | Domesticated cattle used as draft animals and for meat/milk; generally calm when trained and widely kept on farms worldwide. |
| Ostrich | Struthio camelus | 200–275 cm | Bird | Large flightless bird farmed for meat, eggs and feathers; kept on ranches rather than as pets, typically tolerant when raised. |
| Oscar | Astronotus ocellatus | 25–35 cm | Fish | Popular freshwater cichlid in aquaria; intelligent and interactive but territorial, suited to experienced hobbyists. |
| Ocicat | Felis catus | 45–60 cm | Mammal | Domestic cat breed with a wild spotted look; sociable, active and affectionate, kept widely as companion pets. |
| Oriental Shorthair | Felis catus | 45–55 cm | Mammal | Sleek, vocal domestic cat breed related to the Siamese; friendly, people-oriented and commonly kept as household companions. |
| Old English Sheepdog | Canis familiaris | 55–65 cm | Mammal | Shaggy herding dog breed kept as companion and working dog; playful, gentle and requires regular grooming. |
| Otterhound | Canis familiaris | 58–69 cm | Mammal | Large scent hound breed originally used for otter hunting; friendly, energetic and good with active families. |
| Orpington | Gallus gallus | 40–60 cm | Bird | Popular domestic chicken breed for eggs, meat and backyard flocks; calm, broody and beginner-friendly. |
| Orange-winged Amazon | Amazona amazonica | 28–33 cm | Bird | Medium parrot commonly kept as a pet; social, vocal and capable of mimicry, needs interaction and enrichment. |
| Old English Game | Gallus gallus | 30–40 cm | Bird | Traditional chicken breed kept for exhibition and backyard flocks; spirited, hardy and often kept as ornamental or show birds. |