I've never heard of ibuprofen/advil being toxic to dogs. I did a quick search and found out:
Based on the number of dogs treated, The ASPCA Poison Control Center rates Ibuprofen the number one reason for dog poisoning.
The poisoning arises from either the dog having consumed a large number of tablets after chewing through a packet or bottle of Ibuprofen or the dog being intentionally given the drug by a well meaning owner as a pain killer.
From the ASPCA database:
25-125mg per kg of body weight - symptoms include vomiting, diarrhea, abdominal pain, loss of appetite, stomach ulcers;
more than 175mg per kg of body weight - the above symptoms plus blood in the stools, acute kidney failure;
more than 400mg per kg of body weight - the above symptoms plus seizures, coma, disorientation;
more than 600mg per kg of body weight - death. LINK
It never occured to me to give a dog human meds but I guess a lot of people do it intentionally. There were a lot of google hits that said it was "OK" even!
