O and my cat became horribly sick this last dose and don't understand why

I have been using the regular Pet Armor for the last couple of months and I have since found ticks on my cat and 4days after the dose, so I am going to go back to the Pet Armor Plus instead and hope that it actually works. O and my cat became horribly sick this last dose and don't understand why! I have been using pet Armor for 2yrs. Now and never had an issue, but I also ordered from a different sight..

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