Weight Ranges, Pack Colours, and How to Use It Monthly
NexGard Spectra is a monthly oral chew for dogs designed to protect against fleas and ticks while also supporting heartworm prevention and control of common intestinal worms when used as directed. The key to getting proper protection is simple: choose the correct chew based on your dog’s current weight and give it every 30 days.
1) NexGard Spectra Dose by Weight and Pack Colour
Use the table below to match your dog’s weight to the correct NexGard Spectra pack.
NexGard Spectra Weight Range Chart (lbs + kg)
| Pack Colour | Size | Dog Weight Range |
|---|---|---|
| Orange | Extra Small Dogs | 4.4–7.7 lbs / 2–3.5 kg |
| Yellow | Small Dogs | 7.8–16.5 lbs / 3.6–7.5 kg |
| Green | Medium Dogs | 16.6–33 lbs / 7.6–15 kg |
| Purple | Large Dogs | 33.1–66 lbs / 15.1–30 kg |
| Red | Extra Large Dogs | 66–132 lbs / 30.1–60 kg |
| Non-negotiable rule: dose is based on your dog’s current weight, not last month’s weight. |
2) How to Choose the Right NexGard Spectra Pack
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Weigh your dog (ideally the same day you dose, or using a recent accurate weight).
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Match their weight to the table above.
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Pick the correct pack colour and size.
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Give one chew once a month.
If your dog is near a cutoff
If your dog sits right on the edge of a weight range (especially around 7.7/7.8 lbs, 16.5/16.6 lbs, 33/33.1 lbs, etc.), don’t wing it. Re-weigh and follow the pack directions or check with your vet.
3) How Often to Give NexGard Spectra
Once every 30 days. Keep the schedule tight — parasite prevention fails most often because owners drift off the monthly routine. Tip: pick a fixed monthly date (e.g., the 1st) or set a recurring reminder.
4) How to Use NexGard Spectra (Step-by-Step)
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Confirm the correct pack for your dog’s weight (use the chart above).
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Give the chew directly as a treat, or with a small amount of food.
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Watch your dog eat the full chew (this matters).
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Repeat every 30 days for continuous coverage.
If your dog doesn’t take it easily
Offer it when they’re hungry (before a meal). Give with a small bite of food, not a full bowl (so you can confirm it was eaten). If they spit it out or only partially chew it: do not assume they’re protected—you need to ensure the full dose is consumed.
5) Missed Dose Guidance
If you miss a dose, give the next chew as soon as you remember, then continue monthly from that new date (unless your vet advises otherwise). Don’t double dose to “catch up.”
6) Quick Safety Notes
For dogs only. Use exactly as directed on the pack. Ensure your dog meets the minimum age and weight requirements stated on the product packaging. If your dog has a history of neurological issues (including seizures), is unwell, or is on other medications, speak to your vet first.