How old is he? Yorkie adults only tend to poop twice a day so Iīm guessing heīs either a puppy (they poop ALOT more lol) or that he spends ALOT of time in his cage? They dont like to poop where they sleep which is why I wonder.
Until you are fully able to handle just the one yorkie,I wouldent get a second just to keep him entertained

Remember that two pups not only entertain each other,they also DISTRACT each other,so itīs double the work when it comes to training and getting them to calm down and even leaving them alone.Another puppy will not make things easier for you or for Ari,it will actually be more overwhelming for you and it can throw potty training off for the first pup at first as well.They can regress with the arrival of "competition"

.As a rule,one puppy will just sleep when left alone,but two pups will play hard and be mischievous ,and you will come home more than once to a mess (shredded potty pads,eaten poop,chewed shoes,pee puddles because one doesnt hasnt let the other pee in peace on the pad so he has walked half way across the room peeing as the other pesters him lol etc).If one pup seems too much at times to you now,then maybe you should wait
I got two puppies from the same litter,itīs a 24 hour job and a HUGE responsability,so thatīs deffinately something to think about for the pups sake

They need (and love) tons of attention and they do not like to be alone for too long either...even if you have 2.
Oh,and if you do eventually get another male,get them both fixed,because if you dont,they will both be marking ALL over the place to claim the house.Good luck!!