We bought 3 female minis in April and don't have much experience with them. I never even had a dog!! So anyway, yesterday 2 of our minis really got into it. They were bucking one another for about 10 minutes. My six year old was horrified. We distracted them and took them out for a while but later started to do some bucking toward one another. Is this normal? Is there anything we should or could be doing? Why are they doing this?