A dog limping and not putting weight on a back leg can be concerning, especially when the dog suddenly stops using the leg normally.
What is noticed is a dog holding their leg off the ground, struggling to walk, or showing changes in posture and movement.
Knowing what to monitor and when to seek veterinary care can help you respond appropriately.
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Dog Limping and Not Putting Weight on Back Leg: Why It Happens
A dog limping and not putting weight on a back leg may have a significant injury involving the paw, muscles, joints, ligaments, or bones. Common possibilities include a torn cruciate ligament, severe sprain, fracture, dislocation, paw injury, or a foreign object lodged in the foot. In some cases, hip or spinal problems can also cause a dog to avoid using a hind leg.
Because completely refusing to bear weight can indicate a more serious injury, the dog should be assessed by a veterinarian, particularly when the problem develops suddenly.
Dog Limping and Not Putting Weight on Back Leg: Common Causes
Cranial Cruciate Ligament Injury
A cranial cruciate ligament injury is an important cause of sudden or severe hind-leg lameness in dogs.
The ligament helps stabilize the knee, and partial or complete injury can make the joint painful and unstable.
Some dogs suddenly stop bearing weight on the affected back leg, particularly after activity.
Others develop worsening lameness over time. Cruciate disease is also one of the most common joint-related injuries in dogs.
Related: Dog suddenly limping front leg (What it means)
Muscle or Tendon Injury
A strained or injured muscle or tendon can occur after running, jumping, sudden turns, vigorous play, or another unusual movement.
The dog may suddenly become lame and avoid placing weight on the leg.
More significant soft-tissue injuries can produce severe lameness even when there is little or no swelling that an owner can see.
Related: Dog limping and not eating (Here’s why)
Sprain or Other Ligament Injury
Ligaments support and stabilize joints throughout the hind limb. A sudden twist, awkward landing, collision, or other trauma can injure one of these structures.
Depending on the joint involved and severity of the injury, the dog may partially bear weight or refuse to use the leg altogether.
Fracture
A broken bone can cause severe pain and an inability or unwillingness to bear weight. Fractures can follow falls, collisions, being struck by a vehicle, or other trauma, although some bone problems can occur with less obvious injury.
A fracture may cause swelling, an unusual limb position, or obvious deformity, but not every fracture will look abnormal from the outside.
Hip Dislocation
A dislocated hip can cause severe hind-leg lameness, and affected dogs may be unable to put weight on the leg. Trauma such as a fall or collision is a common cause.
The affected limb may be held differently from the normal leg and can sometimes appear rotated or shorter. Hip dislocation requires veterinary assessment and imaging to confirm the problem.
Knee or Other Joint Injury
The knee, hip, hock, and other joints can become painful following trauma or abnormal movement.
Joint injuries may involve cartilage, ligaments, inflammation, instability, or other structural problems.
Because joint and ligament injuries do not always produce an obvious external wound, a dog that suddenly refuses to bear weight should not be assumed to have only a minor strain.
Paw, Nail, or Toe Injury
Not every back-leg limp originates higher up the limb. A torn nail, injured toe, puncture, foreign material between the toes, or painful paw-pad injury can make a dog reluctant to place the foot on the ground.
These problems are particularly worth considering when the limp appeared suddenly, but there was no obvious fall or collision.
Osteoarthritis and Other Chronic Joint Disease
Arthritis can cause hind-leg lameness, stiffness, difficulty rising, and reluctance to exercise.
It more commonly causes intermittent or persistent lameness rather than sudden complete refusal to use the leg, but an arthritic joint can become substantially more painful after an injury or increased activity.
Osteoarthritis can also develop secondary to previous ligament, joint, or developmental problems.
Related: Dog excessively licking paw and limping (Causes and what to do)
Bone or Joint Disease
Less commonly, disease affecting a bone or joint can produce substantial lameness. Some conditions develop gradually, while others may cause a sudden worsening after a period of subtle discomfort.
Persistent or progressively worsening hind-leg lameness therefore deserves an examination even if there has been no known injury.
Nerve or Spinal Problems
Not every dog that appears to have a painful back leg has an orthopedic injury. Problems affecting the nerves, spinal cord, or nerve roots can produce weakness, abnormal limb use, or an apparent limp.
A neurological problem may look different from ordinary pain-related lameness.
A dog may drag or knuckle the paw, have difficulty coordinating the limb, or show weakness rather than simply protecting a painful leg.
Dog Limping but Not Putting Any Weight on Back Leg After Playing or Running
If a dog suddenly stops using a back leg after playing, running, jumping, or making a sharp turn, an acute injury becomes an important consideration.
Muscle strains and sprains are possible, but so are cruciate ligament injuries, joint injuries, fractures, and dislocations.
The fact that the dog was active immediately before the limp does not identify which structure is injured.
A veterinary examination may be needed to distinguish a relatively minor soft-tissue injury from a more significant orthopedic problem.
Dog Not Putting Weight on Back Leg but Not Crying
A dog does not have to cry or whimper for an injury to be painful. Some dogs become quiet and simply avoid using the affected limb.
Likewise, the absence of swelling does not rule out an important injury. Problems involving ligaments, tendons, joints, and nerves may have few visible external signs.
Related: Dog limping after running (Here’s why)
Dog Limping and Not Putting Weight on Back Leg: What to Do
Keep the dog strictly rested and prevent running, jumping, and climbing stairs.
Because complete refusal to bear weight can indicate a significant injury, arrange a veterinary examination, particularly if the problem appeared suddenly or does not quickly improve.
When to Call or Visit the Vet
A dog that is completely avoiding a back leg should generally be assessed by a veterinarian, particularly if the change was sudden or the dog appears painful.
Seek immediate veterinary care if you notice:
Complete refusal to put weight on the leg
Severe or rapidly worsening lameness
Swelling, bruising, or an abnormal-looking limb
The leg appearing twisted, shortened, or held in an unusual position
Significant pain when the dog moves or the limb is touched
Inability to stand or walk normally
A known fall, collision, bite, or other significant trauma
Dragging, knuckling, or poor coordination of the back leg
Weakness affecting more than one limb
Loss of bladder or bowel control along with hind-leg weakness
Lameness that does not improve or keeps returning
A dog that cannot bear weight after substantial trauma or that cannot stand or walk normally should be evaluated immediately rather than encouraged to walk on the injured limb.
Treatment may involve veterinary-directed pain management, restricted activity, rehabilitation, wound care, or surgery depending on the diagnosis.
Key Takeaway
A dog limping and not putting weight on a back leg is a sign that should be taken seriously, particularly when the leg is being carried completely.
Causes range from paw and soft-tissue injuries to cruciate ligament damage, joint injuries, fractures, hip dislocation, and neurological problems.
Because several different conditions can produce the same severe limp, the appearance of the leg alone usually cannot identify the cause.
If your dog suddenly stops using the back leg, has significant pain, or has difficulty standing or walking, veterinary assessment is the safest way to determine what is wrong and how it should be treated.