Broken nails in dogs – symptoms and first aid

Overview

A nail has a hard outer shell protecting a sensitive inner part called the quick. An accident can tear the whole nail off.

Treatment is chosen according to the extent of damage. Trauma is the most common cause of nail disease in dogs.

A study using British patient records from 2019 examined 3,380 nail-clipping events. In 7.37%, only a damaged or broken nail was clipped.

Nails grow continuously and become overlong if they do not wear down or are not trimmed.

A front paw usually has five toes, with the innermost one sitting higher than the others. A back paw generally has four toes, but may also have an additional dewclaw.

Causes

A nail can catch in carpet or upholstery fibres and tear as the dog moves forwards. Grass roots can also catch a nail outdoors.

On landing from a jump, a nail can bend backwards and break. Cutting too far back during trimming injures the quick and causes bleeding.

Blunt nail clippers can tear the nail structure and increase the chance of breakage. Chemical irritation can also cause damage, although most nail trauma is mechanical.

The hard outer part is made of keratin. Blood vessels and nerves run through the quick.

Living tissue exposed when the shell breaks is painful. Trimming only the dead nail tip does not cause the same pain.

An overlong nail can grow into the pad, causing a painful wound that may become infected.

Bacterial nail bed infection is often a secondary problem originally caused by nail trauma.

Risk factors

A long nail catches on objects more easily than a short one. An older dog's nails may become dry and brittle, making them more prone to breakage.

A dewclaw higher up the leg does not wear against the ground in the same way as other nails. Dewclaws are therefore particularly prone to breaking.

Nail diseases affect dogs of different ages and breeds, regardless of sex. Normal wear on hard surfaces does not always keep nails at a suitable length.

The living quick inside an overgrown nail is longer than usual, limiting how much can safely be trimmed at once.

Typical symptoms

• Your dog suddenly starts limping.

• They hold the painful paw up and do not bear weight on it normally.

• Your dog yelps or whimpers when the nail is injured.

• A broken or partly detached piece is visible.

• The nail bleeds.

• Touching around the nail is painful.

Inflammation of the nail fold can cause toe swelling and blood-stained pus.

Bacterial infection involving several nails may also cause fever and lethargy.

A dog in pain may try to snap or bite when the paw is handled.

With recurrent nail disease, detached pieces of nail may be found at home, for example on a carpet.

Your dog repeatedly licks the injured paw.

Bloody paw prints may be left on the floor or bedding.

Bacterial nail infection may also involve enlargement of nearby lymph nodes.

With a yeast infection, brown discharge or crust-like material may collect around the nail.

Complications and consequences

The quick is connected to the toe bone, so a deep infection can spread to the bone. Longstanding bacterial nail bed infection often involves bone infection.

Abnormal nail growth can result from a previous injury. The outlook for ordinary nail trauma is generally excellent.

A treated nail injury may heal in about 7–10 days. New nail growth has been estimated at about 0.8–1.9 millimetres per week.

Licking and chewing the nail can delay wound healing and promote infection.

An excessively tight bandage may cause swollen toes or unusual warmth or coldness. Removal of the living quick can predispose the outermost toe bone to impaired blood supply and tissue death.

Diagnosis at the vet

Assessing the extent of damage

The vet takes a history and examines all paws, nails and the rest of the skin. Trauma is often suspected when only one nail is affected, but a tumour is another possible cause.

X-rays may be used when necessary to investigate changes in the toe and bone. A cell sample from around the nail bed helps investigate inflammation.

Bacterial or fungal culture may be chosen to identify the cause of infection. A skin scraping can check for Demodex mites if compatible skin changes accompany the nail damage.

A blood count and blood biochemistry tests may be included when needed. Samples for fungal culture may be taken from near the nail bed or surrounding hairs.

If a tumour is suspected, tissue examination of the toe lesion helps identify its nature.

When nails keep breaking

When at least two nails are affected, possible underlying causes also include parasites, fungal disease or an immune-mediated nail condition. Symmetrical lupoid onychodystrophy, or SLO, can begin with loss of one nail and later spread to others.

With SLO, a new nail may grow into an abnormal shape.

Yeast can be identified microscopically in a sample of discharge from around the nail.

Treatment

Controlling bleeding and treating the nail

Bleeding is controlled by applying pressure to the injured toe with gauze or a clean towel. Keeping your dog still and calm helps control bleeding.

Dirt around the injury can be gently rinsed away with clean water or saline. Avoid washing with liquids containing alcohol, which can irritate wound cells.

Do not apply creams yourself that may impair healing. Removing an attached broken nail fragment is generally a vet's responsibility.

A small, very loosely attached strip of dead nail can sometimes be trimmed with nail clippers. Quickly tidying a small injury does not always require sedation.

Local anaesthesia or, when needed, sedation may be used for removal. The damaged outer shell is removed according to the extent of the break.

The aim is to preserve the living quick to support good nail regrowth. The vet prescribes pain relief as needed.

The wound may be cleaned with an antiseptic according to veterinary instructions. Antibiotics are not routinely needed for an ordinary clean nail injury.

However, an obviously swollen nail fold with pus may require antibiotics. Culture and susceptibility testing can refine the choice of medicine for a bacterial infection.

The vet may also use a topical antimicrobial to protect an exposed nail bed. At a follow-up appointment, the nail is assessed and the bandage removed or changed.

Paw bandages and protecting healing

A paw bandage protects the injury from dirt and debris. A dressing can also reduce renewed bleeding.

For a clean, uninfected wound, a non-adherent wound contact layer may be chosen. A padding layer protects the treated area and holds the wound contact layer in place.

The outer layer protects the inner layers and reduces moisture reaching the wound. Check the bandage at least morning and evening to make sure it is clean, dry and neither too tight nor too loose.

An infected wound's dressing may need changing once or twice daily until the infection is controlled. The vet determines the bandage-change interval for your dog.

A protective collar prevents licking of the treated nail. Exercise is restricted, and a bandaged dog goes outside on a lead under supervision.

Prevention

Regular nail trimming reduces catching and injury. Dewclaws on the inner side of the wrist also need trimming.

Sharp nail clippers suitable for your dog make a clean cut. Trim a little at a time to avoid the quick containing blood vessels and nerves.

Begin getting a puppy used to nail handling soon after they come home. Rewarding calm acceptance of touch may help a puppy accept nail trimming later.

Some countries prohibit routine removal of dewclaws or dewclaw toes without a veterinary reason.

The pink quick is usually easier to see in a pale nail than in a dark one. Training can begin with touching the nails before any trimming.

Handle only a few nails at a time to give the puppy a chance to become accustomed to it. Hold the paw securely while trimming.

Handling a puppy's healthy nails is often easier when the puppy is already tired. Give the reward immediately as the nail is trimmed so that the puppy associates it with the right event.

No single precisely defined ideal nail length has been established for all dogs.

Important for dog owners

The injured paw can be protected with a towel during transport.

Handle a painful dog carefully, because they may bite even a familiar person.

Note when the nail was injured, whether it caught on something and whether the same nail has caused problems before. Tell the practice about other nails breaking or coming off too. Ask for written instructions on wound cleaning, bandage changes and permitted exercise. Do not forcibly pull off an attached piece of nail.

Outdoors, protect the bandage from water and dirt with a protective boot or another covering as instructed.

Check any exposed toes for swelling, redness and unusual warmth or coldness.

Also watch the skin at the top of the bandage for rubbing and irritation.

If your dog suddenly starts chewing a previously undisturbed bandage, this may indicate a developing problem.

A wet, dirty, smelly or slipped bandage needs reassessment and changing if necessary.

Blood or other discharge coming through the bandage is also a reason to contact the treating practice.

If your dog tears the bandage off completely, contact the practice immediately for another check.

Do not remove the bandage yourself without veterinary instructions.

Under some competition rules, medically necessary removal of a nail or toe does not itself prevent participation, but the dog must be healthy enough to compete.

More generally, organisers may impose stricter participation conditions after a medical procedure than those required by law.

Frequently asked questions

Can I remove a broken nail myself?

It is usually best to leave removal of the damaged part to a vet. The procedure may require sedation or local anaesthesia. At home, the priorities are keeping the situation calm and protecting the paw for transport. Do not pull off an attached fragment. The vet prescribes pain relief as needed.

How long does a broken nail take to heal?

The wound from a treated nail injury may heal in about 7–10 days. Nail growth has been estimated at 0.8–1.9 millimetres per week. The wound settling and the whole nail regrowing are therefore different things. Follow the agreed monitoring plan during healing.

Does a broken nail need antibiotics?

Antibiotics are not routinely needed for an ordinary nail injury. However, a swollen, painful nail fold with pus may require antibiotic treatment. The vet assesses infection and prescribes any medicine needed. At home, monitor discharge, swelling and your dog's condition.

Why are several of my dog's nails coming off or breaking?

When several nails are affected, underlying conditions such as fungal infection or immune-mediated nail disease are also investigated. SLO can begin with loss of one nail and progress to others. Tell the vet the order in which changes appeared. All paws and nails are examined.

When should a vet check a paw bandage?

A wet or dirty bandage needs checking. The same applies if it smells, slips or feels too tight. Swelling or colour changes around the bandage require prompt contact. Do not try to fix the problem by adding tight tape over it.