Barking and potty training were my issues.
Rhia is 2.5 and still sometimes has an accident here or there. Usually it's because she gets SO excited when I get home or because of someone coming over. I just have to watch her extra carefully and take her out as soon as she gets excited. Barking is something that has just begun, since I just moved into an apartment. I like having the window open for the breeze when it's nice out, but as soon as she sees someone walk by.. OHMAN. She barks her little head off at them then runs to me, as if to report her findings. XD As cute as it is, it has to stop. She's getting better at it as we go.
