I rescued a week old kitten, got her all litter trained and on food by 6
weeks.  A real treat for me.  I felt like SuperMom.  At 8 weeks I gave her to
friends since I was moving to another state and staying with my son for a bit
and he and his daughter are allergic.  I had visiting rights til I left and
used them, but felt like something wasn't right with her, she wasn't the
sweet little kitty I gave them.  Most of her toys were in a basket in a
corner, her scratching post was in the basement...  Their answer was..she
didn't use them.  Ultimately I didn't move and the friday before Christmas
they gave her back to me telling me she was a beast...bitting and scratching
all the time.  After 1 day she seemed like she remembered me, loves to be
held and cuddled (on her terms of course) and is very well adjusted. In
conversation with them I discovered they were trying to train her like a
puppy...and were a bit cruel to her.  All I can say is I'm so glad I've got
my furball back.  She plays hard and rough, so I've got toys that I use with
her to get this out of her system...and she loves to lay on me at night and
even crawls under the covers and sleeps "on my lap" when I'm in the fetal
position.  It's useless to keep her off anything, because when I'm working
she does as she wants anyway.  The best way to get her to cuddle is get on
the phone or computer...then she wants ALL my attention.  

I'm so sorry I gave her to them because she has developed a "tough" side to
protect herself.  Imagine, trying to train a kitty like a puppy.....
trying to train a cat like a dog.