Rav, that's the pits.
My friend lived on a golf course and walked his German Shepherd every night loose on the course. One night his dog ran into a wooded area and suddenly started choking and wretching.
My friend ran over thinking he must of swallowed a golf ball!
He reached down into his throat and sure enough there was something round down there so he worked his fingers around it and started grabbing and pulling trying to pull it out. No luck until he realized it was the dogs Adams apple! He figures WTH ?, and then it hit him as the smell of a skunk radiated from the dog. LOL Both he and the dog survived.
When I worked on the farm we had 3 Blue Tick Coon hounds that would run every night. They would always come home but if they didn't they would stay out for 2-3 days walkin slowly looking peaked and come back smelling like skunks.
Hence the expression, "sick as a dog."