Yea coyote68 is right, low light hours are best ,but thats not to say that you can"t call a dog up in the middle of the day. Some times you need to look for just a set of ears over a hill, and some times you need to shoot to keep"em out of your lap. If a dog comes in in the first few mins. he"ll probeblly be comin hard, if after a while he may come in pretty cousiouslly.