Dog tallow

Dog tallow is used to craft the following items:
 * Beast oil
 * Cursed oil
 * Draconid oil
 * Elementa oil
 * Hanged man's venom
 * Hybrid oil
 * Insectoid oil
 * Necrophage oil
 * Relict oil
 * Vampire oil

Dog tallow is actually required for a quest: The Dogcatcher of Vizima. It can be found in many places, but Salamandra bodies are a good bet, as is Shani's house, though the exact location within Shani's house varies. Of course, there is always the option to kill the hapless animals under cover of night.

Associated quest

 * The Dogcatcher of Vizima