I have 2 neutered males. 6 months and 8 months. The younger (Leo) is usually more aggressive but for the last 2 days Ciccio has taken to attacking the blanket I keep on the couch. If Leo even looks at him he hisses and growls. Leo got too close once and Ciccio hooked his claws in poor Leo's mouth! Today Ciccio hissed at me while attacking the blanket but didn't bite or scratch me. But he won't stop attacking the blanket. Any clues to why the sudden/new behavior?