Cat
The purring cat delivers measurable therapeutic benefits documented in peer-reviewed literature. Feline purrs oscillate between 25-150 Hz, frequencies associated with bone density maintenance and wound healing acceleration. Studies indicate cat ownership correlates with 30% reduced risk of cardiovascular mortality, though causation remains debated.
The tactile comfort of feline fur provides documented stress reduction, with cortisol levels decreasing measurably during human-cat interaction. The phenomenon of a cat choosing to sleep on or near its human creates emotional validation that rubber products cannot replicate. This selective affection, precisely because it must be earned, carries greater psychological weight.