Tonkinese cats are a recent cross between the Siamese and Burmese cat breeds, although some assert that Tonkinese-like cats have existed since at least the early 1800s, and the founding cat of the Burmese breed was probably a mink hybrid-colored cat. Some claim that the appearance of the breed is closer to the original appearance of the Siamese, before Siamese breeders developed today's triangular head and very leggy body. The name is not related to the Tonkin region of Indochina. When the breed was first established in Canada, the breed name was actually spelled "Tonkanese," which was a reference to the island in the musical South Pacific where "half-breeds" suffered no discrimination. The mistaken idea that the name was a geographical reference paralleling the Siamese and Burmese breed names resulted in a gradual switch to the current spelling, under which the breed was recognized by the US registering associations.

They are usually intelligent, curious, affectionate with people, and interested in them. Tonks are playful cats, but not hyperactive, although they can be mischievous if they become lonesome or bored. Some interesting toys and a cat tree, or, better yet, another Tonkinese, will keep them occupied when you're not around. Unlike most varieties of cat, they are reported to sometimes, or even often, engage in fetching, and they can often be found perched on the highest object in the house.   They are more like Burmese in temperament than Siamese, that is, less high-strung and demanding. Their voices are also less piercing (or raucous, depending on taste) in most cases than the Siamese, but most Tonks do like a good chat. Most observers feel they combine the more attractive features of both ancestor breeds.