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Why is it that when I scratch my cat on the end of his spine, he enters cat ecstasy?

Hey, Matt:

Why is it when I scratch my cat on the very end of his spine, where the tail connects, he seems to enter throes of cat ecstasy? And why does it only seem to work with male cats?

-- Curiosity and the Cat, the net

This one sent the elves out to test your theories in the field. Luckily they turned in their domestic-animal data before they fell into the fish tank. Grandma Alice is drying them off now, and preliminary results indicate that guppies don't respond. We had much better luck with cats and dogs, all of whom reacted more or less ecstatically, then followed the elves home and are now all piled on the back porch waiting for them to reappear. Breed and gender didn't seem to figure into it, in our experience.

The sacral region of cats and dogs (like humans too) is thick with sensory and motor nerves, all attached to various anatomical fun zones. If you get a good buzz going by stimulating the peripheral nerves, most dogs and cats will respond as you might expect. The main nerve pathways are well buried, so some animals might not react as enthusiastically. It's also vulnerable anatomy, so there's sometimes an element of danger mixed in, which accounts for the heightened alertness. And don't confuse this with an animal's scratch reflex -- that goofy thing your dog does with his back foot when you tickle his side. That's an involuntary response controlled by the spinal cord meant to help rid the skin of insects and irritants. Your dog knows you're already scratching him (creating the "itch" and getting rid of it too), but he can't stop waving that leg anyway.

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Hey, Matt:

Why is it when I scratch my cat on the very end of his spine, where the tail connects, he seems to enter throes of cat ecstasy? And why does it only seem to work with male cats?

-- Curiosity and the Cat, the net

This one sent the elves out to test your theories in the field. Luckily they turned in their domestic-animal data before they fell into the fish tank. Grandma Alice is drying them off now, and preliminary results indicate that guppies don't respond. We had much better luck with cats and dogs, all of whom reacted more or less ecstatically, then followed the elves home and are now all piled on the back porch waiting for them to reappear. Breed and gender didn't seem to figure into it, in our experience.

The sacral region of cats and dogs (like humans too) is thick with sensory and motor nerves, all attached to various anatomical fun zones. If you get a good buzz going by stimulating the peripheral nerves, most dogs and cats will respond as you might expect. The main nerve pathways are well buried, so some animals might not react as enthusiastically. It's also vulnerable anatomy, so there's sometimes an element of danger mixed in, which accounts for the heightened alertness. And don't confuse this with an animal's scratch reflex -- that goofy thing your dog does with his back foot when you tickle his side. That's an involuntary response controlled by the spinal cord meant to help rid the skin of insects and irritants. Your dog knows you're already scratching him (creating the "itch" and getting rid of it too), but he can't stop waving that leg anyway.

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4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs
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