The length of claws in dogs is often perceived as a care issue, but in practice it is an important factor related to biomechanics, posture and joint condition. Through the placement of the paw, the alignment of the limbs and the distribution of the load, the claws participate in the work of the entire kinematic chain: from the fingers to the shoulder and hip joints.
Paw Biomechanics and the Role of Claws
A dog’s paw is a complex system where digital pads, a metapodial pad, joints, and muscles work in concert. With a normal claw length, contact with the surface occurs through the pads, providing stability, cushioning, and proper pressure distribution.
When the length of the claws increases, the position of the paw changes. The claws begin to contact the surface, which affects the centre of pressure and load distribution. This can lead to a displacement of the centre of pressure in the mediolateral direction and a change in the contact area of the paw. The study showed that before trimming, the length of the forepaw print increased by about 2 mm (p = 0.022) and in the subsample with pronounced claw contact, up to 6 mm (p < 0.001), while the contact area increased by 2 cm² (p = 0.024).
Such changes relate to the local mechanics of the paw and include parameters like centre of pressure, pressure distribution and paw length. Many pet owners start paying attention to these subtle shifts only when searching for professional grooming near me, often after noticing posture or movement changes.
Gait and Locomotion: What is Really Changing
It is believed that long claws directly violate gait and locomotion, but the data shows a more complex picture. A study using an instrumented treadmill and pressure-sensing system (9,216 sensors, 200 Hz) revealed no significant changes in key temporal parameters: stride length, stance phase duration, swing duration, and vertical ground reaction forces before and after clipping the claws.
A total of 137 trials were analysed in 7 dogs (average weight 25.3 ± 7.7 kg, height at the withers 57.8 ± 5.7 cm, and age 2.5–6.5 years). Despite the changes at the paw level, the global gait parameters remained stable.
This means that the body is able to compensate for local changes through muscle control and movement adaptation. However, such compensations do not go unnoticed.
Compensation and Muscle Imbalance
When the foot position is disrupted, the compensation mechanism is activated. The alignment of the limbs changes, the load on individual muscle groups increases, and a muscle imbalance forms.
Limiting the range of motion of the fingers and changing the angles of the joints lead to additional tension in the tendons and ligaments. In particular, the load on the digital flexors and proximal joints is increasing.
At the same time, proprioception is deteriorating – the body’s ability to determine the position of the body in space. This reduces stability and increases the risk of injury.
Posturing and Weight Redistribution
The posture line is directly related to the length of the claws. In dogs, about 60% of their body weight is in the forelimbs, so any changes in paw placement immediately affect the entire system.
Long claws can cause weight to shift back, change the position of joints, and form an ineffective stance. In such conditions, muscle tension increases, fatigue develops and stability decreases.
From the point of view of biomechanics, this leads to:
- Changes in joint angles
- Reduced depreciation
- Disruption of load distribution
- Formation of compensatory movement patterns
Connection to Joints and Risk of Injury
Even if global gait parameters remain stable, local changes create conditions for chronic overload.
With prolonged exposure, this can lead to:
- Increased wear of articular cartilage
- The development of inflammation
- Formation of osteoarthritis
- Increased risk of ligament injuries
An additional factor is the reduction of the natural grinding of the claws. In some cases, long claws are not the cause but the consequence of impaired locomotion and decreased activity.
Factors of Claw Growth and Wear
The growth of claws depends on age, activity and conditions of detention. In a 12-year follow-up of 27 dogs, it was shown that the growth rate decreased from about 2.0 mm per week at the age of 3 to about 1.0 mm by the age of 15, with an average decrease of about 3% per year.
Excessive growth is associated with:
- Limited movement on hard surfaces
- Reduced physical activity
- Age-related changes
- Gait disorders
According to veterinary statistics, the problem of excessively long claws occurs in 5.5–7.1% of dogs, which makes it one of the most common.
Grooming Practices and the Meaning of Pruning
Regular clipping of the claws remains a key element of care. Surveys show that 71% of owners consider it necessary, while 48% do it 2-5 times a year and 40% more often.
In practice, more frequent monitoring is recommended, as the optimal length should ensure:
- No contact of the claw with the surface when walking
- Maintaining a normal paw position
- Correct pressure distribution
Limitations of Research and What it Means
It is important to keep in mind that most of the data was obtained from small samples. The described study involved only 7 dogs, which limits the generalisation of the results.
Only short-term effects immediately after pruning were also evaluated. Possible delayed adaptations related to the viscoelastic properties of fabrics were not taken into account.
Nevertheless, the conclusion remains important:
- There are local changes in biomechanics
- The global gait may not change immediately
- Long claws are often an indicator of deeper problems.
The length of the claws affects the biomechanics of a dog through a complex system of relationships: from the centre of pressure and load distribution to posture, muscle balance and joint function.
Even in the absence of obvious changes in gait, factors such as altered posture, compensation, and reduced proprioception can gradually lead to overload and injury. Therefore, the control of the length of the claws is not cosmetic but part of the control of movement, stability and health of the musculoskeletal system.
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