Ok - I REALLY want a third yorkie, but my boyfriend won't let me 

  Believe me, he LOVES our 2 - but he thinks that 3 will be too much work and that we don't have the space.  Granted, we live in an apartment not a house - but it is a huge apartment (4 bedrooms).  What can I do to convince him that 3 yorkies are better than 2?  Or am I just pressing my luck?  We did just get Tuck in March...