My little maltese was about 6 when my son was born. And yes, Casper, was my first 'baby'. He had so much adjusting to do; but he did it. He did still sleep with me though.
I would try to include Casper as much as I could. Throw the ball for him while the baby was in my lap and my son loooved to go for stroller rides so Casper still got his walk.
He'll adjust. You simply do not have the same amount of time to spend with him as you did before. Much as younger children have to adjust when the newest baby comes home . .
Best of Luck.
__________________ Mommy to Lucy, Ringo, and Matthew |