Veterinarians recommend alternatives to rock salt that won’t make your pet ill

The Ache: Ice-melt crystals, ubiquitous in winter, can be toxic if ingested by pets and can cause severe irritation to paws.

The Claim: A growing number of ice-melt products are labeled as safer for pets.

The Verdict: Ice-melt products labeled as pet safe vary widely, and some contain at least some ingredients that aren’t actually safe for pets, veterinarians say. Products made mostly from urea, also an ingredient in fertilizer, are gentlest on paws and least likely to cause poisoning, they say.
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http://www.wsj.com/articles/the-safest-salt-for-your-pet-in-the-snow-1453497985