Article — Dog Metacam Dosage Calculator
The dog Metacam dosage calculator and how to use it safely
Metacam (meloxicam) is a prescription veterinary NSAID dosed at 0.2 mg/kg orally on day 1 (loading dose), then 0.1 mg/kg once daily as maintenance. A 20 kg dog gets 4.0 mg on day 1 and 2.0 mg/day thereafter — that is 2.7 ml of the 1.5 mg/ml oral suspension on day 1 and 1.3 ml/day after. Always give with food. The calculator above does the math; this article explains the why.
Metacam is regulated for good reason: NSAID overdose in dogs causes GI ulcers and acute kidney injury, and the therapeutic window is narrow. This calculator is reference only. Never dose without a current vet prescription, and call the vet immediately for any unusual symptom — vomiting, dark stools, lethargy, refusal to eat.
What is Metacam for dogs?
Metacam is the trade name for meloxicam, a non-steroidal anti-inflammatory drug (NSAID) in the same chemical family as ibuprofen but with much better safety in dogs and a once-daily dosing schedule. It selectively inhibits cyclooxygenase-2 (COX-2), the enzyme that drives pain and inflammation, while sparing COX-1, which protects the stomach lining. This selectivity is why meloxicam is the most-prescribed canine NSAID worldwide.
Indications include osteoarthritis (the most common, often lifelong use), post-surgical pain (commonly after spay/neuter, dental, or orthopedic surgery), and acute soft-tissue injuries. Metacam was FDA-approved for dogs in 2000 and has accumulated 25 years of safety data. The injectable form is used in hospital; the 1.5 mg/ml oral suspension is the take-home formulation, and the 0.5 mg/ml suspension exists for small dogs where the larger concentration would require imprecise droplet measurements.
Meloxicam was originally developed for humans (sold as Mobic) in the 1990s. The veterinary formulation followed once trials showed dogs tolerate the once-daily schedule well. The flavored liquid suspension makes long-term arthritis treatment practical.
How the Metacam dosage calculator works
Three inputs, two outputs. Inputs: dog weight (in pounds or kilograms), day of treatment (day 1 loading or day 2+ maintenance), and bottle concentration (1.5 mg/ml standard, 0.5 mg/ml small-dog). Outputs: dose in milligrams and dose in milliliters, plus an approximate drop count for the rare cases where a dropper bottle is used.
The math is simple but easy to get wrong by hand. A common mistake is using day 1 loading dose throughout the course, which doubles total drug exposure over a week of treatment and substantially increases GI risk. Another is forgetting to switch units — entering pounds while the formula expects kilograms gives a 2.2× overdose. The calculator does the unit conversions and dose-rate switching automatically.
Metacam loading vs. maintenance dose
The loading dose is twice the maintenance dose. It exists to bring tissue concentrations up to the therapeutic range quickly on day 1, after which the daily 0.1 mg/kg replaces what the body clears. Skipping the loading dose means slower onset of pain relief; using the loading dose every day means accumulating drug over a week, which increases risk without much added benefit.
Day 1 0.2 mg/kg PO onceDay 2+ 0.1 mg/kg PO once dailyWith food AlwaysSkip if vomiting Call vetSome vets skip the loading dose for very small dogs or for dogs with marginal kidney function. Always follow the prescription, not a generic dose chart. If the prescription label disagrees with the calculator, follow the prescription — the vet knows your dog's specific situation.
Picking the right Metacam concentration
Two oral concentrations:
- 1.5 mg/ml standard suspension — used for most dogs over 10 lb. The bottle includes a graduated dosing syringe with weight markings.
- 0.5 mg/ml small-dog suspension — used for dogs under 10–15 lb where precise dosing matters. Three times the volume per milligram, so each ml is easier to measure accurately.
For a 5 lb dog, 0.5 mg/ml is much safer because the daily dose is only 0.23 mg — that's 0.15 ml of 1.5 mg/ml suspension (hard to measure precisely) versus 0.46 ml of 0.5 mg/ml (manageable). Many vets reflexively prescribe 0.5 mg/ml for any dog under 15 lb for this reason.
Always use the dosing syringe that came with the bottle, not a household measuring spoon. The syringes are calibrated to the suspension density and have weight-based markings (in lb) that match the concentration.
Metacam side effects in dogs
Most dogs tolerate Metacam well, but side effects do occur. The most common, especially in the first week, is mild GI upset — soft stools, mild vomiting, reduced appetite. Giving with food prevents most cases. If GI signs persist or worsen, stop dosing and call the vet.
Less common but more serious: dark or tarry stools (sign of GI bleeding), increased thirst and urination (early kidney injury sign), pale or yellowing gums (liver problem), lethargy without obvious cause. Any of these warrants immediate veterinary contact. For long-term Metacam users (chronic arthritis), vets typically check blood chemistry every 6 to 12 months to catch kidney or liver changes early.
Dogs who cannot take Metacam
Absolute contraindications: kidney disease, liver disease, current GI ulcer or recent ulcer history, bleeding disorders, dehydration, pregnancy, lactation, age under 6 weeks, history of severe NSAID intolerance. Relative contraindications (use only with careful monitoring): age over 12 years, congestive heart failure, mild kidney function decline, concurrent use of ACE inhibitors or diuretics.
Drug interactions matter. Never combine Metacam with: another NSAID (carprofen, aspirin, ibuprofen), corticosteroids (prednisone, dexamethasone), nephrotoxic drugs (gentamicin, furosemide at high doses). The combination of NSAID + corticosteroid is particularly dangerous — it dramatically increases the risk of GI ulcers and is sometimes called "the NSAID washout violation."
Metacam vs. other dog NSAIDs
Five veterinary NSAIDs are commonly used in dogs:
- Metacam (meloxicam) — once daily, oral or injectable, good for chronic use.
- Rimadyl (carprofen) — twice daily oral, tablets only, similar safety profile.
- Deramaxx (deracoxib) — once daily oral, COX-2 selective, often used post-orthopedic surgery.
- Previcox (firocoxib) — once daily oral, COX-2 selective, popular for chronic arthritis.
- Galliprant (grapiprant) — a newer non-NSAID anti-inflammatory, safer for senior dogs with marginal organ function.
Effectiveness is broadly similar across this class for routine arthritis pain. The choice often depends on what works for an individual dog (some tolerate one better than another), cost, and the vet's familiarity. For dogs that cannot tolerate any NSAID, alternatives include Galliprant, gabapentin, amantadine, and tramadol — though those work through different mechanisms and have their own considerations.