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ok so I went and read this website:

https://www.yourpetsbestfriend.com/your_pets_best_friend/2010/03/why-cats-sharpen-their-claws.html

So I have some questions to ask:

  1. how many times does a cat has use its claw to lose its razor-sharpness and become like this?

enter image description here

  1. when a cat scratch a tree or any hard objects, it sheds its worn outer sheaths and will become like this: (the big one is before it sharpen, the small one is after). I heard that there claws have layers like an onion, so how many layers does it has on its claw? how many times can it do this in one day, i mean can it do this sharpening method everytime or it has a limit?

enter image description here

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  • $\begingroup$ this question could use of clarity and research. $\endgroup$ – John Mar 29 '20 at 23:45
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New horn sheathes continually grow throughout a cat's life. The mechanism is described in depth in the following:

The highly complex architecture of the cornified claw sheath is generated by the living epidermis that is supported by the dermis and distal phalanx. The latter is characterized by an ossified unguicular hood, which overhangs the bony articular base and unguicular process of the distal phalanx and creates an unguicular recess. The dermis covers the complex surface of the bony distal phalanx but also creates special structures, such as a dorsal dermal papilla that points distally and a curved ledge on the medial and lateral sides of the unguicular process. The hard‐cornified external coronary horn and proximal cone horn form the root of the cornified claw sheath within the unguicular recess, which is deeper on the dorsal side than on the medial and lateral sides. As a consequence, their rate of horn production is greater dorsally, which contributes to the overall palmo‐apical curvature of the cornified claw sheath. The external coronary and proximal cone horn is worn down through normal use as it is pushed apically. The hard‐cornified apical cone horn is generated by the living epidermis enveloping the base and free part of the dorsal dermal papilla. It forms nested horn cones that eventually form the core of the hardened tip of the cornified claw. The sides of the cornified claw sheath are formed by the newly described hard‐cornified blade horn, which originates from the living epidermis located on the slanted face of the curved ledge. As the blade horn is moved apically, it entrains and integrates the hard‐cornified parietal horn on its internal side. It is covered by the external coronary and proximal cone horn on its external side. The soft‐cornified terminal horn extends distally from the parietal horn and covers the dermal claw bed at the tip of the uniguicular process, thereby filling the space created by the converging apical cone and blade horn. The soft‐cornified sole horn fills the space between the cutting edges of blade horn on the palmar side of the cornified claw sheath. The superficial soft‐cornified perioplic horn is produced on the internal side of the unguicular pleat, which surrounds the root of the cornified claw sheath. The shedding of apical horn caps is made possible by the appearance of microcracks in the superficial layers of the external coronary and proximal cone horn in the course of deformations of the cornified claw sheath, which is subjected to tensile forces during climbing or prey catching. These microcracks propagate tangentially through the coronary horn and do not injure the underlying living epidermal and dermal tissues. This built‐in shedding mechanism maintains sharp claw tips and ensures the freeing of the claws from the substrate.

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  • $\begingroup$ is it possible to put your answers on the numbers of my question, please $\endgroup$ – user3556983 Mar 29 '20 at 5:05

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