Can Roundup weed killer kill cats?

Yes, Roundup weed killer can kill cats if precautions are not taken. The pest control in question contains glyphosate, which is toxic to people and pets when contact is made while the active ingredient still is effective. Glyphosate exposure requires diluting any amounts ingested with milk or water, rinsing eyes for 20 minutes and taking the beloved feline to the veterinarian as quickly as possible.