http://www.heraldsun.com.au/sport/su...-1226759506183
Black Caviar's half-brother "Jimmy" (a $5 mil yearling, now southern hemisphere 2yo) got bitten by a white tail spider and had a reaction to the antiobiotics, leading to diarrhea. He's now 50/50 with a bad case of laminitis.
I've heard of horses having reactions to shots or crazy things happening to youngsters but geez.