If it's just humping I wouldn't be too concerned. Gasket used to hump Tappet and would hold on with his teeth to Tap's fur and pull clumps out. But it never escalated beyond that. Conversely Widget and Sprocket have had a couple of serious spats and the first one there was fur everywhere, like masses of fur. :shock: And bite wounds. But we haven't seperated them beyond the initial event, and they seem (fingers crossed) to have calmed down a bit lately.