Why do a cat’s nails crack?

Nail cracking can come from poor nutrition, lack of exercise, over-trimming, over-long nails, injury, infection, or dehydration. If the cat lacks nutrition such as vitamins or minerals, the nails become brittle and crack easily. Long indoor life or over-trimming also weakens nails. Bacterial or fungal infection can damage the nails and cause cracking. Treat according to the specific cause.