Zombie cows?

So my Dad called me this evening to tell me about a Zombie cow that he has on the farm...yes, a zombie cow. The conversation started with him telling me about a cow he had penned this afternoon and its symptoms: flat ears (denoting illness of sorts) a lolling tongue, and some dullness of the eyes (possible blindness). He said that he has had cattle with lead poisoning exhibit similar symptoms...resulting in death of the animal. Then, Dad proceeded to ask me if I'd seen Zombie Land (a movie suggested to him by my brother). My brother has gotten into the mind-set over the last few months that the zombie apocalypse is probable and has encouraged my parents to prepare for the worst. (!!) All I've absorbed is: cardio workouts are good...then you can outrun a zombie (although, do we really know how fast a zombie will run?). Regardless, Dad phoned to warn me that he may have a zombie cow on his farm and that he may be a zombie as of tonight...I am to record this account in the history books so that everyone who does make it out of the apocalypse as a human will know that the carnage started at the Stewart Farm. Our code word, to tell if Dad is still human or not is: pip. It is the definition of the dots on a dice...yes, he has been helping my Grandma do too many crossword puzzles. After all this and a near tearful farewell to my Dad, he informs that it may possibly be rabies. Yup, a cow with rabies...so, it'll go around biting other cows with its herbivorous teeth? Geez...I love my family, but...!!!