Perhaps more than any other species, humans are excellent at making tiny differences into massive gulfs. This can be seen in racism, sexism, homophobia and even in the quickly distancing term used to describe some criminals: monsters. Garou, who are part human, have pickedup neatly on these sorts of activities and even perhaps exceed huamnity's capacity for them. This Gift, which raises up hatred and suspicion, is an example of that. It is taught by a dog spirit.
By spending one Gnosis point, and rolling Manipulation + Brawl, difficulty 7, the Garou can exacerbate divisions between individuals or groups. Note that the Gift cannot actually create anger and divisions; they must already exist to be exploited. If used on the theoretical 'perfect family', the Gift would fail. Among humans, the Gift simply prevents any resolution of issues and difficulties, possibly breaking into violence. One success might cause targets to raise voices at one another, three would spell lawsuits, and five might bring them to blows. Amongst Garou and other shapeshifters with Rage, however, the Gift is even more powerful. Every sucess on the initial roll adds one success on all Rage rolls the targets make through out the scene. With such manipulation, it is doubtful that any peace can be made, and highly probable new troubles will emerge.