Which ingredient do pet-safer antifreezes use instead of ethylene glycol?

Propylene glycol.

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  1. Propylene glycol ✔
  2. Methanol
  3. Acetone

Why: Propylene glycol has a much wider margin of safety than ethylene glycol, according to the ASPCA. Still, keep all antifreeze capped and out of reach.

Huh, didn't know that: The ASPCA says there is an antidote for antifreeze poisoning, but treatment must start as soon as possible.

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References

Answer: Propylene glycol. Propylene glycol has a much wider margin of safety than ethylene glycol, according to the ASPCA. Still, keep all antifreeze capped and out of reach.

  1. ASPCA, Dangers of Antifreeze and Your Pets www.aspca.org/news/digging-deeper-getting-facts-dangers-antifreeze-and-your-pets
    these versions of antifreeze contain propylene glycol, which has a much wider margin of safety
    Checked 2026-10-10.

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