I've used Sentinel Tabs for a few years now. My dogs have never had heart worms so I suppose that the tabs are doing that job well. Fleas are different however. In the last six months my dogs have slowly started getting more and more fleas. I thought that my product might have expired but the expiration date is still a year away. Disappointing that it is no longer effective with fleas. It concerns me that it may also lose its effectiveness with heart worms also. It appears that I'll be needing to get flea collars and change to a different heart worm/ flea & tick killer.

Excellent Product . Was prescribed for my fur baby over 10 years ago.

Price is good has worked well for my dog for a number of years. I would definitely recommend this product.

Its protection heartworm and fleas I purchase every year

I have used these for many or my small dogs - they eat them right up and I have never had any issues with fleas, ticks, etc.

Very small pills easy to get lost so keep eye out for them if your dogs like mine n spits out

Great meds! The dogs ate them right up no crushing and putting in food. They ate and said you want a treat and they gobbled one up. Will definitely stick to this brand.

Love the product but hate the price. I have just gone back to Heartgard.