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Hello, this is Dr. Jess. I Am very sorry to hear about this kitty! If she is having breathing difficulty then she could be having an anaphylactic reaction to the product and needs emergency treatment- she needs oxygen supplementation, and injectable steroids and benadryl. I would suggest she take the kitty to the vet immediately as this could be life threatening without treatment!
Here is an article on this issue: http://www.petmd.com/cat/conditions/neurological/c_ct_pyrethrin_pyrethroid_toxicity
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