My Corgi, Kara, is about 2.5 years old - she's got a fairly strong personality, but I've worked hard with her on her worst tendencies, and we've managed to nip most of those in the bud. Lately, though, I'm seeing some behavior towards the cat that makes me nervous. Kara has always herded him a lot, and constantly wants to chase him - her prey drive is strong, and we try to reign in the chasing a…