The smartest dog I ever had was maybe 2 years old at the time and was drawn like flies to cowpies when I left a pan of antifreeze unguarded for 5 minutes. I caught him with his mug in it and rushed him to the vet.
Vet gave him an IV of Everclear which I calculated to be the equivalent of my taking 6 oz of 100 proof vodka on an empty stomach all in one swallow. [The ethanol-which is what Everclear is-prevents the production of toxic metabolites which result in the formation of calcium oxalate crystals in the kidneys .] The crystals cause kidney damage/failure and death within a very few days. Works the same way in humans except that humans have access to kidney dialysis.
Dog stood there for maybe a minute following the IV and then just folded over like a drunk falling off a barstool. Kept giving him the Everclear plus IV Valium several X daily for a couple of days to prevent the seizures which are a side effect of the ethylene glycol metabolites, then slowly brought him out of the drug stupor and he was fine. Lived to almost 13. Vet said if I had not gotten him to the clinic within an hour he probably wouldn't have made it.
MORAL: NEVER be a moron like I was and leave ANY ethylene glycol-based antifreeze where an animal can find it. This means even what looks like a minor leak on the driveway. ALWAYS rinse spills immediately with a lot of water. Takes only a couple of teaspoons to kill a cat or dog. It has a sweet taste which is why so many animals are attracted.