In the cat vs. dog debate, people on both sides are equally vehement. But one side is more likely to want their whole house to be covered in evidence of their affection, and that's cat lovers. If you're friends with one of these friendly zealots, you know it. If you'd like to show them you see their enthusiasm and appreciate it, getting a gift that celebrates their cat or their love of cats is the way to go. We've rounded up several gifts any cat-obsessed pet parent will want (if they don't own them already.) From home decor to cat...