There are so many choices when it comes to buying ice melt, also known as rock salt, snow melt, and deicer.  Consumer Reports recently did a study on each.  (I've attached a helpful link to this page.)  

Perhaps one of the most interesting finds is the fact rock salt, or sodium chloride, is probably the least expensive salt to buy.  But it can be the most harmful to concrete, brick, stone, metal, grass, plants, and pets.  Instead, Urea, or Carbonyl Diamide, might be a better choice, especially when it comes to your beloved animals.  

A few other tips include never using ice melt on concrete less than a year old because newly poured concrete needs time to cure and settle.  Sand or gravel might be better.  Also, avoid spreading ice melt around plants and your lawn.  Also, always wipe your animal's paws with a moist towel after walking outside on snowy days.  Colored salt can help you keep track of where the placement is in the snow.  If your pet ingests melt, you can call the Pet Poison Helpline (800-213-6680) or Animal Poison Control Center (888-426-4435).  There is typically a fee you have to pay for using these services.