There are two kinds of Sluggo: classic metaldehyde bait which is extremely effective where I live, kills quickly, and dying slugs leave an obvious slime trail as they flee and die. Boom, no snails.
The iron phosphate Sluggo is the newer, greener version. If I use it regularly for several days, I think I see fewer snails eventually. Never see dead slugs or a dying slime trial.
The reason anyone would use the less effective newer version is that, if you feed a big enough handful of the effective metaldehyde bait to a dog, he will get sick and might even die if he was a small enough dog. Since you would scatter that much bait over many square yards, even dedicated, hard-working very stupid dogs can't collect enough of it to hurt themselves.
I think you could pour the whole box of
iron phosphate slug bait into the dog's bowl without any symptoms.
Cats are too smart to eat anything with the bitter additive they use now.
"Metaldehyde is classified by the U.S. Environmental Protection Agency (EPA) as a "slightly toxic compound""
"/SIGNS AND SYMPTOMS/
Chronic poisoning is practically impossible; amounts less than those that cause acute poisoning have no effect ...
[IPCS; Poisons Information Monograph 332: Metaldehyde (June, 1990).
Available from, as of October 9, 2009:
http://www.inchem.org/pages/pi... **PEER REVIEWED** "
https://toxnet.nlm.nih.gov/cgi...
Acute oral lethal dose ... 100 mg/kg in humans
<I think that would be ~8 GRAMS of metaldehyde for an 80-kilo person, so you would have to eat 246 grams or over a HALF POUND of 3.25% bait to experience acute toxicity. It's toxicity is that low. If my arithmetic is correct.>
But there are many people who don't want ANY of anything called "toxic".