As far as training goes, I feel like it was easier for me to socialize Penny because I just carried her when I took Lion on walks every day. He was reliably potty trained before we got her, but I don't think that made a difference in her potty training. Some say that the new dog will copy the first dog and be easier to potty train but that wasn't the case here.Oh, how sweet! That 2nd pic makes me feel like I need to run out and get Axel a little buddy immediately! Was Lion a good big brother training wise or was it distracting to have him there when you were trying to show Penny the right thing to do? Also do you feel like your house is overrun with dogs having 2? Is it easy to get out and about with them when your are trying to keep an eye on 2?