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Whilst declawing is illegal in many countries of the world, it remains surprisingly common in others, including North America, where it is performed electively to stop cats from damaging furniture, or as a means of avoiding scratches.
The operation to declaw does not just remove the claw, but also the end bone of the toe. Previous research has focused on short-term issues following surgery, such as lameness, chewing of toes and infection, but the long-term health effects of this procedure have not to date been investigated.
For the study, the author group, based in North America, investigated a total of 137 non-declawed cats and 137 declawed cats, of which 33 were declawed on all four feet. All 274 cats were physically examined for signs of pain and barbering (excessive licking or chewing of fur) and their medical history was reviewed for unwanted behaviours.
They found that inappropriate toileting, biting, aggression and over-grooming occurred significantly more often in the declawed cats than the non-declawed cats (roughly 7, 4, 3 and 3 times more often, respectively, based on the calculated odds ratio).
A declawed cat was also almost 3 times more likely to be diagnosed with back pain than a non-declawed cat (potentially due to shortening of the declawed limb and altered gait, and/or chronic pain at the site of the surgery causing compensatory weight shift to the pelvic limbs).
International Cat Care has issued a position statement saying that even if surgical techniques were improved to negate some of the adverse effects of declawing, it would remain of the opinion that the procedure is unethical other than if required to manage a medical condition, and should be legislated against wherever possible.
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It's not really new - The Paw Project in America has known this information for years and is slowly (state by state) trying to get America to outlaw declawing.