He and his girlfriend moved in together

She has a 9 month old Maltese that will not poo on any pad nor will it poo outside. My son said that he's had the dog with him outside half a day and no poo. My son said as soon as he would open the front door she would take the biggest poo in the house within minutes. He said he refuses to have poo all over the house. She will pee on her pad. I know Jemma won't poo where she peed. I suggested he put more pads down in different places. He's been there done that.
I'm so new to the small breed that I just have no clue what to say to him. Sons, hmmmm, expect Mom to have all the answers....I should ..wink wink
I asked for help here already today...sigh...sorry bout that. Ummm, no I'm not, lol
Carol and Jemma
Lots of pee and poo words in this post eh?