I adopted a 7 mo kitten from a shelter in May 2014, then in October 2014 I adopted a 2 mo kitten and she was not litter trained. I tried my best to adjust the 2 cats but it was impossible! The latter was popping all over the house, even in my older kitty food and water plates, it was disgusting, they were constantly fighting and hissing at each other so I gave the kitten up for adoption in March 2015, after months of cleaning messes all over the place and being miserable.