Sentinel Spectrum for dogs is a monthly tasty chew for the prevention and control of fleas, heartworm and intestinal worms in dogs.


Milbemycin oxime, praziquantel and lufenuron are the active ingredients in Sentinel Spectrum Tasty Chews.

Sentinel Spectrum Tasty Chews are beef-flavoured, and studies have shown they are so palatable that 97% of dogs accept them straight from the hand.

Dosage and Administration- How to treat your dog with Sentinel

Once a month, ideally on the same date.

If a dose is overdue by <15 days, treat immediately and resume monthly dosing.

If a dose is missed by 15-30 days, heartworm prevention can be maintained if treated immediately and monthly dosing resumes for at least the next 2 months.

If a dose is missed by >60 days, a veterinarian must be consulted in case the animal has contracted heartworm. Dosing may be recommenced, and a blood test for adult heartworm must be performed after 6 months.

Dose must be given with a full meal, either within food or immediately afterwards (to allow effective absorption of lufenuron).

Sentinel Spectrum Tasty Chews can be safely used in puppies from 6 weeks of age, breeding males and females, and collies sensitive to ivermectin.

Sentinel Spectrum Tasty Chews have been safety tested at up to 10 times the recommended dose.

If an animal with adult heartworm infection (and therefore circulating microfilariae) is given Sentinel Spectrum, a transient shock-like reaction can occur. To avoid this, dogs should be tested for adult heartworm and treated if necessary, before starting Sentinel Spectrum.