How did your dog react?!

I have a 120 lb male rottie. He is the biggest baby who grew up around Yorkies so of course, he thinks he is as small as them. Some people say dogs can sense pregnancy and he has yet to since it cause he still try's sitting in my lap etc. 
ANYWAYS... My little girl is due in June and my question is.. For those who have big dogs how was yours before came and how did or does he/she react to a baby in the house? 
Thanks!!

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