# Prednisone and Hind Leg Weakness in Dogs: What to Know Hind leg weakness in dogs on prednisone is a recognized side effect of long-term or high-dose steroid treatment, and it usually points to a muscle problem called steroid myopathy. It is not the same as pain, arthritis, or a spinal injury, and the difference matters because the treatment for each is very different. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Prednisone can cause true muscle weakness in the hind legs, most often after weeks to months of treatment or with higher doses. This is called steroid myopathy or hyperadrenocorticoid myopathy [1]. - The weakness is typically dose-related and often improves when the dose is lowered or the drug is tapered, but only under veterinary direction. - Weak back legs on prednisone are not always caused by the drug. Arthritis, disc disease, nerve problems, and other conditions can look similar. - Never stop prednisone suddenly on your own. Abrupt withdrawal can cause a serious adrenal crisis. - Call your veterinarian if weakness is new, worsening, or affecting your dog's ability to stand, walk, or urinate. ## What Prednisone Is and Why Veterinarians Prescribe It Prednisone is a synthetic glucocorticoid, a lab-made version of a hormone your dog's body already produces. It is one of the most widely used drugs in veterinary medicine because it calms inflammation and suppresses the immune system. Veterinarians prescribe it for many conditions. Common uses include allergic and inflammatory skin disease, inflammatory bowel disease, immune-mediated blood disorders, inflammatory neuromuscular disease, certain cancers, and spinal or joint inflammation. In one reported case, a dog with inflammatory neuromuscular disease was treated with prednisone as part of its care [2]. In another, glucocorticoid injections helped a dog with chronic neck pain and forelimb lameness [3]. Prednisone is also a standard part of CHOP chemotherapy for dogs with B-cell lymphoma [4]. The dose and duration depend entirely on what is being treated. A short course for an allergic flare looks nothing like months of immunosuppressive therapy. ## How Prednisone Works and Why It Can Weaken the Hind Legs Prednisone works by binding to receptors inside cells and changing how those cells behave. It reduces the production of inflammatory chemicals, dampens immune activity, and alters metabolism. These effects are powerful and useful, but they also change how muscle tissue handles protein and energy. When a dog's body is exposed to high levels of glucocorticoids for a long time, either from medication or from a disease like Cushing's syndrome, muscles can waste away. This is called hyperadrenocorticoid myopathy, sometimes shortened to Cushing myopathy [1]. The classic signs of hyperadrenocorticism, which include increased thirst and urination, increased appetite, and a pendulous abdomen, usually show up before the muscle signs do [1]. The muscle weakness tends to affect the hind legs first or most obviously. Dogs may look wobbly, drag their toes, struggle to rise from the floor, or have trouble on stairs. Muscle atrophy, meaning visible loss of muscle mass, is a hallmark [1]. Affected dogs may also have elevated creatine kinase (CK) activity on blood work, along with abnormal electromyography and muscle biopsy findings [1]. It helps to understand that this is a metabolic muscle problem, not a nerve injury. The nerves are often fine. The muscle fibers themselves are not maintaining themselves properly. ## Dosing Basics: Who Decides, How It Is Given, and Missed Doses Your veterinarian decides the dose. It is calculated from your dog's weight, the condition being treated, the severity of that condition, and your dog's overall health. There is no single correct dose for all dogs. In research settings, immunosuppressive doses as high as 2 mg/kg per day have been used in healthy dogs [5], but that is a study dose, not a prescription for your pet. Prednisone is usually given by mouth as a tablet or liquid. It is best given with food to reduce stomach upset. Some dogs take it once daily, some every other day, depending on the plan. If you miss a dose, do not double up. Call your veterinarian or your pharmacy for guidance on that specific medication plan. If you miss several doses in a row, call your veterinarian before restarting, because the plan may need to change. Tapering is common with prednisone. The drug is often reduced slowly instead of stopped all at once. This is because the adrenal glands can become dependent on outside steroids and stop producing their own cortisol. Stopping suddenly can trigger a life-threatening Addisonian crisis, which can mimic acute kidney injury and cause severe electrolyte problems [6]. Your veterinarian will give you a specific taper schedule. Follow it exactly. ## Common and Serious Side Effects | Side effect | How common or serious | What to do | |---|---|---| | Increased thirst and urination | Very common, expected | Provide fresh water. Report excessive urination or accidents in the house. | | Increased appetite | Very common, expected | Measure meals. Do not free-feed. | | Panting, restlessness | Common | Mention it at your next visit if it is mild. Call if severe. | | Hind leg weakness or muscle loss | Uncommon to common with long-term use, potentially serious | Call your veterinarian. Do not adjust the dose yourself. | | Vomiting or diarrhea | Common, usually mild | Call if it lasts more than a day or your dog stops eating. | | Potbelly, thin skin, hair loss | Common with long-term use | Report at routine visits. These often improve after tapering. | | Signs of infection (fever, lethargy, wounds that will not heal) | Uncommon but serious | Call your veterinarian the same day. | | Black or tarry stool, vomiting blood | Rare but an emergency | Go to an emergency clinic now. | | Collapse, severe weakness, inability to stand | Rare but an emergency | Go to an emergency clinic now. | Some side effects are simply part of being on a steroid. Others are warning signs. The line between them is not always obvious to an owner, so when in doubt, call. For a broader look at what to expect, see [What Are the Side Effects of Prednisone in Dogs?](/knowledge/veterinary-medicine/pet-medication-guide/prednisone-side-effects-dogs). One important point about lab work: glucocorticoids can raise the urine protein-to-creatinine ratio in dogs, even without kidney disease [7]. If your dog has protein in the urine while on prednisone, your veterinarian may want to look for other causes before assuming kidney damage [7]. ## Hind Leg Weakness in Dogs on Prednisone: Steroid Myopathy or Something Else? This is the question most owners are really asking. Weak back legs on prednisone can have several explanations, and they are not mutually exclusive. ### Steroid myopathy This is muscle weakness caused by glucocorticoid exposure. It fits the pattern of gradual onset over weeks, symmetric hind leg weakness, muscle wasting, and no obvious pain [1]. It is more likely with higher doses and longer treatment. It is also seen in dogs with naturally occurring Cushing's disease, not just in dogs taking prednisone [1]. ### The original disease getting worse If your dog is on prednisone for a spinal problem, arthritis, or a nerve condition, the weakness may be the disease progressing, not the drug. This is why recheck exams matter. ### A new problem Dogs on prednisone have suppressed immune systems, which can allow infections to take hold. One report described a dog on prednisone for inflammatory neuromuscular disease that developed progressive weakness and muscle wasting from disseminated neosporosis, an infection that can be masked by steroid therapy [2]. In that case, antibody tests were negative even though the infection was present [2]. This is a reminder that not every new weakness is a drug side effect. ### Pain versus weakness Pain makes dogs reluctant to move. Weakness makes dogs unable to move normally even when they want to. Watch your dog carefully. Does he try to rise and fail, or does he refuse to try? That distinction helps your veterinarian. If your dog is limping instead of weak, different problems come into play. You can read more about front limb issues in [Dog Hurt Front Leg Limping](/knowledge/veterinary-medicine/symptom-guides/dog-hurt-front-leg-limping) and [Why Is My Dog Limping On Front Leg](/knowledge/veterinary-medicine/symptom-guides/dog-limping-front-leg). ## Who Should Not Take Prednisone and What Interacts With It Prednisone is not right for every dog. Your veterinarian will weigh the risks if your dog has diabetes, kidney disease, heart disease, a current infection, a history of stomach ulcers, or is pregnant. Dogs with Cushing's disease already have too much glucocorticoid, so extra steroids can worsen muscle wasting [1]. Several drug interactions matter. Nonsteroidal anti-inflammatory drugs (NSAIDs) like carprofen or meloxicam increase the risk of stomach ulcers when combined with prednisone. Certain antifungals, some antibiotics, and some seizure medications can change how prednisone is processed. Vaccines may be less effective in a dog on immunosuppressive doses. Always tell your veterinarian about every medication, supplement, and topical product your dog receives. Do not start anything new without asking first. ## Overdose and When to Call for Help If your dog eats more prednisone than prescribed, call your veterinarian or a pet poison control hotline right away. Signs of a large single overdose can include vomiting, diarrhea, agitation, and a fast heart rate. Serious effects are more likely with repeated overdoses than a single extra tablet, but any overdose deserves a call. If your dog is collapsing, having seizures, breathing abnormally, or cannot stand, go to an emergency clinic immediately. ## Limitations and When to Contact a Veterinarian No article can tell you whether your dog's weakness is from prednisone, from the condition being treated, or from something new. That requires an examination, often with blood work and sometimes imaging. Your veterinarian needs to see your dog to sort this out. Call your veterinarian the same day if you notice new or worsening hind leg weakness, muscle loss, reluctance to rise, dragging of the toes, or a change in how your dog walks. Go to an emergency clinic now if your dog cannot stand, collapses, has trouble breathing, has a seizure, vomits blood, or passes black tarry stool. Schedule a routine visit if you notice mild increases in thirst, urination, or appetite, or if you have questions about the taper schedule. These are common and often manageable, but they are worth discussing. Do not change the dose or stop prednisone on your own. The adrenal glands may not be able to respond, and sudden withdrawal can be dangerous. ## Frequently Asked Questions ### Will my dog's hind leg weakness go away after prednisone is stopped? It often improves once the dose is reduced or the drug is tapered, but recovery takes time. Muscle that has been lost has to be rebuilt, and that can take weeks to months. Some dogs regain full function, while others keep some weakness. Your veterinarian can track progress with exams and, in some cases, repeat blood work. ### Is steroid myopathy in dogs painful? No, steroid myopathy is not typically a painful condition. It causes weakness and muscle wasting, not soreness [1]. If your dog seems painful, especially along the spine or in the hips, that points toward a different problem and should be evaluated. ### Can I just lower the prednisone dose myself to see if the weakness improves? No. Changing the dose on your own can cause a relapse of the disease being treated or trigger an adrenal crisis. The taper has to be planned around your dog's condition and how long the drug has been given. Call your veterinarian and ask about adjusting the plan. ### How long does it take for prednisone to cause muscle weakness in dogs? It varies with the dose and the individual dog. Muscle signs usually appear after the classic signs of excess glucocorticoid, such as increased thirst, urination, and appetite [1]. Many owners notice changes after several weeks of treatment, but some dogs show signs sooner. There is no fixed timeline that applies to every dog. ### What tests might my veterinarian run for weak back legs on prednisone? Your veterinarian may start with a physical and neurologic exam, then blood work that includes a creatine kinase level [1]. Depending on findings, they may recommend electromyography, muscle biopsy, or imaging of the spine [1]. If an infection is suspected, additional testing may be needed, since steroid therapy can suppress antibody responses and make some tests falsely negative [2]. For more on dosing, tapering, and side effects, see [Prednisone for Dogs: Steroid Dosing Tapering and Side Effects](/knowledge/veterinary-medicine/calculators-clinical-tools/prednisone-for-dogs-steroid-dosing-tapering-and-side-effects) and [Prednisone for Dogs: Uses, Side Effects, and Safety Guidelines](/knowledge/veterinary-medicine/preventive-care/prednisone-for-dogs-uses-side-effects-and-safety-guidelines). ## Related Articles - [What Are the Side Effects of Prednisone in Dogs?](/knowledge/veterinary-medicine/pet-medication-guide/prednisone-side-effects-dogs) - [Prednisone for Dogs: Steroid Dosing Tapering and Side Effects](/knowledge/veterinary-medicine/calculators-clinical-tools/prednisone-for-dogs-steroid-dosing-tapering-and-side-effects) - [Dog Hurt Front Leg Limping](/knowledge/veterinary-medicine/symptom-guides/dog-hurt-front-leg-limping) - [Why Is My Dog Limping On Front Leg](/knowledge/veterinary-medicine/symptom-guides/dog-limping-front-leg) - [Prednisone for Dogs: Uses, Side Effects, and Safety Guidelines](/knowledge/veterinary-medicine/preventive-care/prednisone-for-dogs-uses-side-effects-and-safety-guidelines) - [Why Is My Dog Limping On The Front Leg](/knowledge/veterinary-medicine/symptom-guides/dog-limping-front-leg) - [Hind Leg Weakness in Dogs With Cushing's Disease](/knowledge/veterinary-medicine/endocrine-diseases/cushing-disease-hind-leg-weakness-dogs) - [Dog Not Using Back Leg: Causes of Hind Leg Weakness](/knowledge/veterinary-medicine/symptom-guides/dog-not-using-back-leg) - [Hind Leg Weakness in Dogs: Treatment and Home Support](/knowledge/veterinary-medicine/senior-and-chronic-care/hind-leg-weakness-dogs-treatment) - [Endocrine Testing: Low-Dose Dexamethasone Suppression for Cushing's Disease in Dogs](/knowledge/diagnostics/endocrinology/endocrine-testing-low-dose-dexamethasone-suppression-for-cushings-disease) ## References 1. [Hyperadrenocorticoid Myopathy in Dogs - Musculoskeletal System](https://www.merckvetmanual.com/musculoskeletal-system/myopathies-in-dogs-and-cats/hyperadrenocorticoid-myopathy-in-dogs). Merck Veterinary Manual. 2. [Seronegative disseminated neosporosis with fatal outcome in an adult dog following prednisone therapy](https://pubmed.ncbi.nlm.nih.gov/41612780/). Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc, 2026. 3. [Use of ultrasound-guided percutaneous perineural corticosteroid injections for refractory cervical pain secondary to vertebral venous system abnormality in a dog](https://pubmed.ncbi.nlm.nih.gov/42467980/). Journal of veterinary internal medicine, 2026. 4. [Afucosylated anti-canine CD20 antibody combined with cyclophosphamide, doxorubicin, vincristine, and prednisone chemotherapy in dogs with B-cell lymphoma](https://pubmed.ncbi.nlm.nih.gov/41742528/). Journal of veterinary internal medicine, 2026. 5. [Effects of High-Dose Prednisone on the Gastrointestinal Microbiota of Healthy Dogs](https://pubmed.ncbi.nlm.nih.gov/40266941/). Veterinary sciences, 2025. 6. [Addisonian Crisis Mimicking Acute Kidney Injury in Dogs: A Retrospective Study of 34 Dogs Diagnosed with Acute Kidney Injury in Romania](https://pubmed.ncbi.nlm.nih.gov/41598282/). Life (Basel, Switzerland), 2026. 7. [Glucocorticoids do not cause a clinically relevant elevation in the urine protein-to-creatinine ratio in dogs with inflammatory protein-losing enteropathy](https://pubmed.ncbi.nlm.nih.gov/41659955/). Frontiers in veterinary science, 2025. ## Further Reading - [American Veterinary Medical Association: First Aid Tips for Pet Owners](https://www.avma.org/resources-tools/pet-owners/emergencycare/first-aid-tips-pet-owners) - [Merck Veterinary Manual: Dog Owners](https://www.merckvetmanual.com/dog-owners) - [Cornell Richard P. Riney Canine Health Center: Canine Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information)