i would wait a few more weeks, if jr is mounting and scruffing his hormones havnt settled.

Also make sure you do it on neutral ground dont add one to anothers living quarters, put some ferretone onto all their necks to distract them,

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Tiggy, 13 yr old Collie x Alsation, Lucy 11 yr old epileptic cross breed, Kara, collie x whippet