1. Brody was pee pad trained at 11 weeks. Then we had some ups and downs and some confusion issues when we went from the pad to outside. I would say he was RELIABLY trained (no accidents and able to hold it for at least 4 hours) at about 8 months old.
2. Do you mean play biting? Brody never really did that. We played with balls and toys, never with our hands. He might have play nipped a couple times as a baby, but not after he was taught that was not acceptable.
3. Brody started losing the hair on his neck as a puppy. It got thinner and thinner until he was bald. He has no neck hair, only a little bit of hair on his chest and inside his legs. The vet said it is genetic. He doesn't have mites/fleas/etc. Some dogs that have the blue gene have the propensity towards alopecia (baldness). You can google color dilution alopecia to find out more.
My Pippa is a house dog because I have no backyard, I have a large verandah are she can go outside if she wants, but we enjoy going for walks in the park each day.
I brough her home at 7 weeks and trained her on a towel in the bathroom, she is 6 months old now and has had maybe 3 accidents, problem is she wont go potty outside on the grass when we go walking.
As to biting , she did like to chew my fingers but I said no don`t bite Mummy and I replaced my fingers with a rawhide chewy, so she doesn`t try to bite now.