Kansas State University Veterinary Teaching Hospital offers a free 24-hour poison control hotline that is available to all pet owners in North America. Their number is 1-785-532-5679.
There are several other organizations that offer poison control hotlines to the public, but most require payment for their services. The ASPCA National Animal Poison Control Center is the largest poison control hotline for animals in North America and is open 24 hours a day, seven days a week. The organization's number is 1-888-426-4435, and it charges a $65 consultation fee as of early 2015.
Pet Poison Helpline is also available 24 hours a day, seven days a week, and charges $39 for each consultation as of early 2015. Their number is 1-800-213-6680.