I would say it could be he flew off because he is still so young. He is not matured yet - kind of a teenager. I bet he was overwhelmed with the situation.Thank you all. I assumed it was a hawk because that is what we have around here during the day, which is when it happened. We usually have dogs in and out all day along with me checking on them multiple times. The hawks always fly off when we run out. But I have caught them flying off from the yard before. I will definitely keep them contained for a bit now.
So Oscar is 18.5 weeks and quite big. Why would he have flown out of the yard? The older gals (especially Buffy) was not giving in. He's trying to be on top but is only in the lower middle. Could this be why he flew off?