A dog's toenail is a complex structure:

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Composition: Like human nails, they are primarily composed of keratin. However, unlike humans, dog nails are directly attached to the toe bone.
Structure: Each nail has two main parts:
- The outer shell: This hard outer layer provides traction and helps dogs maintain balance.
- The quick: This inner part contains the blood vessels and nerves, making it sensitive.
Visibility: In dogs with white nails, the quick is easily visible as a pink triangle within the nail. However, it's much harder to see in dogs with dark nails.

A cat's claw is a remarkable feat of feline engineering:

Composition: Like dog nails, they are composed primarily of keratin, a strong and resilient protein.
Structure: Cat claws are unique in their retractable design. They grow from a sheath within the cat's paw and can be extended and retracted at will.
- The quick: As with dogs, the quick is the sensitive inner part containing blood vessels and nerves.
Function: Cat claws are essential for their survival:
- Hunting: They are used for capturing prey.
- Climbing: They provide excellent traction for navigating vertical surfaces.
- Defense: They serve as a powerful means of self-defense.
Maintenance: Regular claw maintenance, such as scratching on appropriate surfaces, is crucial for keeping them healthy and preventing excessive growth.