Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose and treat the cause of deformed cat nails [title] Look for thicker nails. [step] The nails of cats should be thin and sharp, not thick. If your cat's nails become thicker and harder, this may be a symptom of an underlying health problem.

Ending1: [substeps] Older cats can develop thicker nails as they age. Thickening of the nails sometimes occurs with an increase thirst. Ending2: You should look for a consistency of coarse and angular nails in your cat's home. [substeps] Mature cats will have thicker nails than younger cats. Ending3: It is normal for nails to grow thicker, whereas a cat with nails slightly thicker should have signs of depression and other behavioral problems. Hair loss at the top might indicate a health problem. Ending4: Signs to look for include : [substeps] Yellowing nails looking like lumps or spots. [title] Watch your cat's nails closely.

Answer format: ending1/ending2/ending3/ending4