Calculate Your Dog's Supplement Dosage
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Joint Supplement (Glucosamine)
Based on 20 mg glucosamine per kg body weight daily. Split into AM/PM doses for better absorption.
Shop joint supplements on Amazon →Omega-3 Fish Oil (EPA + DHA)
Combined EPA + DHA. Most human fish oil capsules contain ~300 mg EPA+DHA. Dog-specific products vary.
Shop dog omega-3 on Amazon →Probiotics
CFU count based on weight. Most dog probiotic products dose per sachet or scoop — check the label for its CFU count.
Shop dog probiotics on Amazon →Calming Supplement (L-Tryptophan / L-Theanine)
L-Tryptophan dose. For L-Theanine, typical dose is 1–2 mg per kg. Always start at the lower end.
Shop calming supplements on Amazon →Disclaimer: These are general guidelines based on published veterinary literature and manufacturer recommendations. They are not a substitute for veterinary advice. Always consult your vet before starting any supplement, especially if your dog is on medication, pregnant, or has existing health conditions.
How Dosage Is Calculated
Supplement dosages are primarily determined by your dog's body weight, with adjustments for breed size category. Larger dogs need proportionally more of most supplements, but the relationship is not always linear — very small dogs sometimes need slightly higher per-kg doses because of their faster metabolic rate.
Joint Supplement Dosage Guide
Glucosamine is the most widely used joint supplement for dogs. The standard veterinary dose is 20 mg per kg of body weight per day, though some vets recommend up to 30 mg/kg for dogs with established arthritis. Most commercial dog joint supplements combine glucosamine with chondroitin, MSM, and/or green-lipped mussel — follow the product label as these combination products have their own dosing.
For dogs over 25 kg, we recommend splitting the daily dose into morning and evening servings for better absorption and sustained blood levels throughout the day.
Omega-3 Fish Oil Dosage Guide
Omega-3 dosing for dogs is based on the combined EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) content, not the total fish oil weight. The standard recommendation is 50–75 mg combined EPA+DHA per kg of body weight daily for general health, rising to 100 mg/kg for dogs with inflammatory conditions.
When choosing a product, look at the nutrition panel — a 1000 mg fish oil capsule might only contain 180 mg EPA and 120 mg DHA (300 mg combined). Dog-specific omega-3 products like Lintbells YuDERM Dog are formulated at appropriate concentrations and are easier to dose accurately.
Probiotic Dosage Guide
Canine probiotics are dosed by colony-forming units (CFU) rather than weight in milligrams. The general guideline is 1–10 billion CFU per day, with smaller dogs at the lower end and larger dogs at the higher end. Most quality dog probiotic products (like YuDIGEST) come in pre-measured sachets that are already appropriate for a range of body weights.
Calming Supplement Dosage Guide
L-Tryptophan, an amino acid precursor to serotonin, is the most common calming supplement ingredient. The standard dose is 5–10 mg per kg of body weight daily. L-Theanine (from green tea) is used at 1–2 mg per kg daily. Many calming supplements combine both with additional ingredients like chamomile, valerian, or B vitamins.
Calming supplements typically take 2–4 weeks of consistent daily use to reach their full effect. They are most effective as part of a broader behaviour management plan — they work best alongside training and environmental modifications, not as a standalone solution.
Frequently Asked Questions
How do I calculate my dog's supplement dosage?
Most dog supplements are dosed by body weight. Use our calculator above — enter your dog's weight in kg and we'll show the recommended daily dosage for joint supplements, omega-3 fish oil, probiotics, and calming supplements based on standard veterinary guidelines.
Can I overdose my dog on supplements?
Yes — while most supplements have a wide safety margin, giving significantly more than the recommended dose can cause problems. Fat-soluble vitamins (A, D, E, K) can accumulate and become toxic. Always follow the manufacturer's dosing guidelines and consult your vet if your dog is on medication.
Do supplement dosages change with breed?
Dosage is primarily determined by body weight, but breed can matter. Large and giant breeds (Great Danes, Mastiffs) may benefit from higher joint supplement doses due to greater joint stress. Brachycephalic breeds (Bulldogs, Pugs) may need adjusted calming supplement doses. Our calculator accounts for breed size category.
Should I split the dose or give it all at once?
For most supplements, splitting into morning and evening doses is preferable — it maintains more consistent blood levels and reduces the chance of digestive upset. This is especially important for joint supplements in dogs over 25 kg and for probiotics, which benefit from twice-daily dosing to maintain gut colonisation.