According to the product label for Petcor Flea Spray, it does say that some cats may be sensitive to products containing pyrethrins. Excessive salvation and ear and paw flicking may occur; however, these effects are temporary and not harmful. May cause dermal sensitization (skin allergy). If there are concerns about using certain products, we would recommend reading the product label in full and/or contacting a veterinarian.
Yes, Petcor is a good option for treating ticks on dogs.
We apologize for any confusion. Petcor Flea Spray contains natural Pyrethrins which have no residual properties, which is what that answer is referring to. There is no residual to continue to kill anything. (S)-Methoprene (which is an IGR only) will remain for a time though it does not kill anything directly. It only prevents young from maturing into reproducing adults. As a result, any pre-adult fleas that then contact the animal it is applied to will not be able to mature. If you want to continue to kill adults that get onto your animals, then you will have to reapply as needed.
Petcor Flea Spray is only labeled to kill fleas, ticks, and lice. It does contain natural Pyrethrins, which is a non-selective insecticide, so it will likely kill other insects on contact. Another option is Wondercide Flea and Tick Control for Pets and Home, which will kill most pests on contact and can be used daily.
Per the product label Petcor Flea Spray can be reapplied as often as weekly of your pet becomes reinfested with adult fleas for outside sources. Please let us know if we can be of any more assistance.