My tea cup poodle is just over a year old & has never been constipated. She had her first annual heart worm check & vaccines a few days ago & her rear end has had problems since. She's pooped a lot more & they seem sollid. But she has four times now seemed to be unable to push & there's been poop on her butt area. As I take the warm cloth to wipe her off, it seems like more comes for quite a while. Like I can't clean her up. She seems otherwise normal. Wet nose, plays.. but she's distrssed when the poop thing happens. How can I help her?