He was born in 2007 and now is showing prey drive? Sounds a bit weird to me. Sure he's not just playing? That's ok, though with smaller cats and a terrier you need to be there to step in to make sure it stays to a dull roars and no one accidentally gets hurt.
If you really see it a 'prey' drive the point of that is to KILL. So I'd be on that with zero tolerance. Frankly, you just need to be vigilant and use your 'leave it' command before it starts up.
If this is new and different you may just also change up your life for a bit. Join some fun dog classes. Get a kayak you can take your dog for rides in. Find places to go hiking. Get some dog friends more appropriately sized and go for dog play dates/walks. More rousing games of Chuckit in a huge field.
Alot of time being proactive and managing my dogs away from an issue works much better than corrections and punishments with a new issue. Get those dogs tired out and not caring about their new annoying bad habit.
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