I have had Australian Cattle dogs & they can be very stubborn. If you yell at it the results could be more barking. I had a female cattle dog that use to sit out on the side hill & bark her head off. The only way I could get her to stop was bring her inside. I have my dogs trained to sleep on rugs in the entry. I also would put them in the garage where they would not have deer to bark at etc. They are very territoral this breed of dog. Is your male dog older then the females? I would just grab him & pull him off the females. He needs to learn some respect. This breed of dog does require lots of exercise they can be nervous & high strung too. They can be very loyal & will do what you tell them but you have to have control over them. Using a leash & working with obedience can help too. Believe me I have had three of these dogs in my life time & know what you are dealing with.