It also really does make a difference on how you go about separating them . Be calm, cool, with NO shouting or angry talk. Try not to yell either of there names while you separate them. Quickly pick them up by the nap of their neck and than put them on a time out !!
Keep up the good work.... believe me I know form experience there is a light at the end of the tunnel.
"Fight Free now for 7 weeks and counting"