There is no single best arthritis medicine for every dog. The most effective approach depends on your dog’s age, kidney and liver health, pain severity, and how well they tolerate specific drugs. That said, prescription NSAIDs remain the first-line treatment for canine osteoarthritis, and most dogs start there. A newer monthly injection offers comparable pain relief with fewer daily-pill hassles, and several add-on therapies can make a real difference when one medication alone isn’t enough.
NSAIDs: The Standard First Choice
Nonsteroidal anti-inflammatory drugs are the most widely prescribed arthritis medications for dogs. They work by reducing the production of prostaglandins, chemicals your dog’s body makes in response to joint damage that cause swelling, warmth, and pain. Six NSAIDs are currently FDA-approved for use in dogs in the United States: carprofen, deracoxib, firocoxib, grapiprant, meloxicam, and robenacoxib. Of these, robenacoxib is only approved for a maximum of three days, making it better suited for acute pain than long-term arthritis management.
Carprofen and meloxicam have the longest track records and the most clinical data behind them. Firocoxib and deracoxib are newer options designed to be more selective in targeting inflammation while sparing the stomach lining. Grapiprant works through a different mechanism than the others, blocking a specific pain and inflammation pathway rather than prostaglandins broadly, which can make it gentler on the gut and kidneys. Your vet will typically pick based on your dog’s bloodwork, breed, and any history of stomach sensitivity.
The most important thing to know about long-term NSAID use is that it requires monitoring. Kidney and liver function should be checked with bloodwork before starting any NSAID, then rechecked periodically. Older dogs are especially vulnerable to kidney effects, and catching changes early makes all the difference. Baseline values give your vet something to compare against, so don’t skip that initial blood panel even if your dog seems perfectly healthy otherwise.
Monthly Antibody Injections
Bedinvetmab (sold as Librela) is a monoclonal antibody given as a monthly injection at your vet’s office. Instead of blocking inflammation the way NSAIDs do, it targets nerve growth factor, a protein that amplifies pain signals in arthritic joints. It’s a fundamentally different approach: rather than reducing swelling, it turns down the volume on pain.
In a head-to-head clinical trial comparing bedinvetmab to meloxicam, both treatments produced significant pain reduction. Dogs receiving the monthly injection saw an average 19.7-point drop in pain scores over the study period, while dogs on meloxicam saw a 17.1-point drop. The difference between the two wasn’t statistically significant, meaning they performed comparably. Pain improvement with bedinvetmab became noticeable by day 14, matching the clinically meaningful threshold at that point.
The appeal of this option is convenience and safety profile. One injection per month replaces daily pills, and because it doesn’t pass through the liver or kidneys the way NSAIDs do, it can be a better fit for dogs with organ disease or those who can’t tolerate oral anti-inflammatories. The downside is cost, which runs higher than generic NSAIDs for most dog sizes.
Injectable Joint-Protective Therapy
Adequan (polysulfated glycosaminoglycan) is in a different category entirely. Rather than just managing pain, it’s classified as a disease-modifying agent, meaning it aims to slow cartilage breakdown. It works by getting incorporated into damaged cartilage, inhibiting the enzymes that chew up joint tissue, and stimulating the cells that repair cartilage and joint fluid.
The FDA-approved protocol is an intramuscular injection at 2 mg per pound of body weight, given twice weekly for four weeks. After that loading phase, many vets transition to maintenance injections at longer intervals. Adequan is often used alongside an NSAID rather than as a replacement, since it addresses the structural disease while the NSAID handles day-to-day pain and inflammation.
Add-On Pain Medications
When NSAIDs alone aren’t controlling your dog’s pain, vets commonly layer on additional medications. Two of the most frequently used are gabapentin and amantadine, both of which target pain through the nervous system rather than through inflammation.
Gabapentin calms overactive nerve signaling, which is especially useful in chronic pain where the nervous system has become hypersensitive. It’s typically dosed every 6 to 8 hours for adequate pain coverage, though many dogs are initially prescribed it every 12 hours. If your dog doesn’t seem to respond well, the dosing frequency may need adjusting before concluding it doesn’t work. Sedation is the most common side effect, usually worst in the first few days.
Amantadine works on a different pain pathway, blocking receptors in the spinal cord that amplify chronic pain signals over time. In a clinical study, dogs receiving an NSAID plus amantadine were more active and scored lower on lameness scales than dogs on NSAIDs alone. It’s given once or twice daily, with twice-daily dosing likely more effective based on how quickly the body processes it. These medications aren’t replacements for NSAIDs but powerful partners that address pain your dog’s anti-inflammatory might be missing.
Supplements: What Works and What Doesn’t
Fish oil is the supplement with the strongest evidence behind it. The omega-3 fatty acids EPA and DHA have genuine anti-inflammatory effects in joints. Colorado State University’s veterinary hospital recommends a therapeutic dose of 310 mg of combined EPA and DHA per kilogram of metabolic body weight per day for dogs with osteoarthritis. That’s substantially more than what most over-the-counter pet fish oil products provide per capsule, so check the label carefully. You need the EPA and DHA numbers specifically, not just the total “fish oil” amount.
Glucosamine and chondroitin, despite being the most popular joint supplements on pet store shelves, have very poor evidence of effectiveness. A 2022 systematic review and meta-analysis found that chondroitin-glucosamine supplements showed 88.9% non-effect and 0% measurable effect on osteoarthritis pain in dogs and cats. The review concluded these products “should no longer be recommended for pain management in canine and feline osteoarthritis.” The placebo groups in some studies actually performed slightly better than the supplement groups. If you’re spending money on glucosamine chews, that budget is almost certainly better redirected toward fish oil or prescription treatment.
Laser Therapy as a Complement
Low-level laser therapy is a non-drug option that’s gaining traction at veterinary clinics. A typical protocol involves weekly sessions for six weeks. In a retrospective study of 17 dogs with osteoarthritis, both pain interference scores and veterinary pain ratings dropped significantly after just the first session and continued improving through the full course. By week two, 13 of the 17 dogs had their pain medications reduced. By the end of the study, 6 dogs had their pain medications stopped entirely and another 7 had them decreased. No side effects were observed.
Laser therapy won’t replace medications for most dogs with moderate to severe arthritis, but it can reduce how much medication they need. Sessions typically cost $40 to $80 each, so the six-week course represents a meaningful investment.
Weight Loss May Matter More Than Any Drug
If your arthritic dog is overweight, weight loss is arguably the single most impactful intervention available. A study tracking obese dogs with osteoarthritis found that lameness improved significantly once dogs lost just 6.1% of their body weight. Gait analysis confirmed measurable improvement at 8.85% weight loss. By the end of the study, 82% of dogs showed reduced lameness.
For a 70-pound dog, that 6% threshold is only about 4 pounds. That’s an achievable target over 6 to 8 weeks with portion control and won’t require dramatic dietary changes. Every excess pound puts additional stress on already damaged joints, and no medication can fully compensate for that mechanical load. If your vet has mentioned your dog could stand to lose weight, treating that as seriously as any prescription will amplify everything else you’re doing.
Putting a Plan Together
Most dogs with arthritis end up on some combination of treatments rather than a single magic pill. A typical starting plan looks like a daily NSAID plus therapeutic-dose fish oil, with weight management if needed. If that’s not enough, your vet might add gabapentin or amantadine, consider Adequan injections, or switch to monthly Librela injections. Laser therapy or physical rehabilitation can layer on top of any of these.
The “best” medicine is really the best combination for your individual dog, arrived at through some trial and adjustment. What works brilliantly for a young Labrador with mild hip dysplasia may not be appropriate for a 13-year-old with kidney disease. Starting with bloodwork, being honest about your budget, and tracking your dog’s mobility at home gives your vet the information they need to build and refine a plan that actually keeps your dog comfortable.