
- Split in nail, whether horizonal or vertical
- Bleeding or discharge from nail
- Bloodstains on floors, carpet, or beds
- Visible damage to nail
- Hanging nail
- Sloughing nails
- Discolored nails
- Brittle nails
- Discolored nails
- Exposed flesh under nail
- Inflammation and swelling around nail
- Limping
- Favoring one leg or holding up paw
- Yelping
- Excessively licking nail and paw
- Nail injury – Trauma to the nail can occur during play or normal activity, causing breaks, splits or torn toenails. This can be from hard running on rough surfaces such as asphalt, getting a nail caught in carpet or on a deck, or even from landing wrong on the feet. Dogs who are active during sleep can even snag a nail on their bedding.
- Nail trimming accidents – Cutting nails too short or incorrectly can result in breaks and splits. Often, cutting too far down the nail can cut into the quick, the blood vessel inside the nail, and can cause instant, heavy bleeding and pain.
- Age – As dogs grow older, their nails can become more fragile and may suffer from splits due to their brittleness.
- Poor nutrition – Vitamin or mineral deficiencies, or a lack of enough basic nutrients can upset the natural balance of building blocks in the body, causing brittle nails that can split, along with poor coat quality, lethargy and weight loss. Homemade or poor diets may not offer the right amounts of essential nutrients for proper growth and maintenance. Supplements can overload the body with specific nutrients and also cause an imbalance.
- Vasculitis – Inflammation of the blood vessels can be caused by infections, allergies, insect bites, or bacterial, fungal or viral infections.
- Infections – Bacterial or parasitic infections can result in brittle nails that can split. Ringworm causes itchy, dry skin and brittle claws.
- Illness – Various endocrine disorders, cancers, viruses and autoimmune diseases can cause split nails in dogs. Symmetric lupoid onychodystrophy, an autoimmune disorder, commonly causes abnormal nail conditions, such as splitting nails, sloughing nails and pain.
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