WOW...that pic you commented on brings back memories...Rainy the dog on the right now lives in NewYork with Joanna, Rainy and Calvin:) I had promised her I would always keep her but she had some anxiety issues with being left home so Joanna's parents adopted her and she is a queen in her own household. They also adopted Calvin the Cardi from me and he lives with Joanna and her husband.
So where is Loretto MN? To awnser your question...personally I have almost always had 3 dogs. Depends on their personalities,space and if you have enough time. Mine get along great. I'll send you more info but I just got home from work and have to be back on the road by 6 am.