Last year,my greyhound Dan was very ill,we nearly lost him.He turned yellow overnight with jaundice,he's a white dog but his skin,eyes,lips,everything was yellow.We rushed him to the vets,the first thing the vet asked was,'have you given him paracetamol or ibruprofen?'I hadn't.he said his symptoms were some sort of chemical poisoning.He was admitted,and on a drip for 3 days with a poor prognosis.All the tests indicated poisoning(but not warfarin)but couldn't be pinpointed.Luckily he pulled through,but was liver-damaged for 6months.He's a devil for drinking from dirty puddles when we're out walking,and my feeling is he'd swallowed something washed off the farmers fields.
But I would never give a dog paracetomol or ibruprofen,asprin,my vet says,is ok.