I have a five-year-old cow, born here on my place. She had her second calve two months ago, the birth was normal, the calve was small but up and sucking and all has been well. I put out hay last Saturday and noticed that the cow was walking stiff legged on the rear legs. She would take four or five steps then walk normally. I have watched her for a week and there is no improvement. My other cattle are fine at this time. All cattle were vaccinated and wormed three months ago by my vet. Does anyone have any input or experience with this.