Any help appreciated I have two girls will be 4 in December. They have lived together since we adopted them at 12 weeks. Moose has always been very timid only has cuddles with 3 people anyone else she will run and hide Tank her sister is very out going and loves everyone. They always used to sleep and snuggle together but the past 6 months or so they tend to fight and Moose will always hiss and growl at her sister. Why do they do this. I just want them to be loving sisters again. Thank you.