This question may sound silly but I have no experience whatsoever with breeding or raising dogs. Some dog breeds, such as the Basenji, tend to have their heat cycle and later have litters during the month December/January and sometimes during the summer season, i.e. August every year. I would like to know whether the Whippets have litters during a certain period (month/s) of the year or if this dog breed can have litters during any month of the year.