Is it safe to use both Sentinel and Frontline together for my dogs flea protection?

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Is it safe to use both Sentinel and Frontline together for my dogs flea protection?

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I have 4 dogs and a cat, every vet visit costs me over $1000. I recently ask my vet if Sentinel was better than Frontline when it came to flea protection and she advised using the Sentinel for the cat and two seperate products one for fleas and one for heartworms for the dogs. Using both on any animal, cat or dog is dangerous to both the pet and the owner because of too much flea medication being applied to the pet.

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