Will dog food cause mad cow disease?

Hi doctor,

I am a 23-year-old male, 5.6 feet, 140 pounds. So about two months ago I had to feed some puppies. They did not want to eat from the plate so I fed them by hand, their dog food. I always was an anxious person so I eventually thought about it. Read the ingredients of the dog food and read meat flour. My mind went straight for mad cow disease risk. I thought I am sure these dog food have spinal tissue, brain, bone in the meat flour mix. Did my research and I am correct. Many dog food companies do that. So it is impossible to get rid of every trace of dog food from my clothes, keyboards, pockets, etc. I already did that but you know I was not aware of these for the time I was feeding them. My question is, in the worst case how much time do I have before the symptoms start? First exposure might been two months or a month and a half ago. I am thinking of blowing my savings and traveling before the symptoms start and then after I confirm the disease, do not even know what to do.