Just in the last 3 months, Mayson has started to bark and whine whenever he wants attention and it's driving me insane.

It gets especially worse when were at another person's house. Lately, I've been saying no and trying to ignore him, but that doesn't seem to be working...he just continues to whine. Sometimes he whines so hard that his entire body shakes and he acts like his entire world is falling apart. Does anyone have any suggestions on what i can do to make him stop?