At 4 mos., my girl seemed like a model pup, both peeing and pooing on command. She even knew the difference. Now that she's turned 5 mos., not only does she ignore me, but if I keep saying "go potty," she starts whimpering. She also doesn't want to go very often any more. So far, no accidents indoors, but it seems odd that she wants to hold it so long. She used to pee every time I took her out (every few hours and after naps), but now only 4 times or so a day. She gets treats after going, and I praise when she goes, but she even seems disinterested in those things now. She mostly seems to want to smell the spring odors in the air and is very distractable. Is this normal? Any suggestions?