[2] Leptofelis vallesiensis is theorized to have had long and slender legs, and to weigh between 7.21–9.02 kg (15.9–19.9 lb), similar in size to a caracal or serval.

[2] Leptofelis seemed to prefer open woodland habitat, as evidenced by finds at Cerro de los Batallones.

This cat was contemporaneous with such herbivores as horses like Hipparion, the hornless rhinoceros Aceratherium, the gomphotherid mastodon Tetralophodon, the suid Microstonyx, silvatherid giraffes and boselaphine antelope.

Leptofelis was also contemporary with the Amphicyonid Magericyon, machairodonts Machairodus, Promegantereon, and Paramachairodus, the bear Indarctos, and the small hyenid Protictitherium.

[3] The environment of Batallones was a highly variable habitat, with scattered vegetation throughout open areas of grassland.