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Even tiny amounts can cause a major reaction, especially if it's this worst of the worst variety. Clinical signs may not occur for several hours, but cardiac failure or death can occur fairly rapidly, up to a few days after ingestion. And this odd, related garden threat can also be fatally toxic.

But first, you'll see other symptoms. And while it can be mild, it's fatal 27% to 58% of the time. In dogs that eventually die from it, these six symptoms have been noted. Since there's no simple cure, you'll want to take these actions to prevent it.