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It's not speed that kills, it's the sudden stop. Barrels make the sudden stop less sudden. by spreading the stop over time.
It causes tornadoes
Slaughter.
C02
Asphyxiation
There are several causes of sudden water retention. Poor circulation, premenstrual symptoms, salt, or a blockage in the lymphatic system can all cause this condition.
a surge of testosterone in males and it causes ovulation in females.
Improper diet
Ingesting Ipecac
testosterone
A shock is something which causes sudden, heavy impact, a sudden electrical charge, or an amount of considerable emotional impact.
I would ask your vet but that sounds like Parvo