I am so sorry to hear about starting off with a ailment to treat
that really sucks and your breeder should've fully disclosed everything to you.
If I were you, I"d make an appt with the vet asap and get him evaluated, since you breeder may be assuming he has something and treating him with another dog's medicine (you never know!!! Especially, if he isn't showing symptoms)
I'm not too familiar with the condition, I'd push water...encourage it, or feed him some wet food to loosen the stools, serious constipation can be just as painful for them (I know it is for my girl)
My husband is a believer of that old' wives tale about dry noses, and I suppose it may be a symptom of dehydration, perhaps that is where the saying came from.
He is so very cute!! I can see why you are smitten
Stick around and ask any questions you need to, we are here to help