Oh, Eddie!  Well, dad - maybe 'cause he was in a strange house where the chi is marking?  Or, sometimes, I think just if anything is different in their world.  My Abbie has been 99.99% 

 papertrained since around 10months; but, if someone new comes into the house, I'm likely to find an accident in the hall 

 .  Very disapointing.   
This Summer should be just a blast when my sisters come.  One is bringing at least one dog and two ferrets! lol