Sibling Rivalry

It's like I have two children now, and they are quite jealous of one another. Abby's been with me for about seven years, and then here came Roxy last week. They fight over Triscuits and popcorn. Roxy's a little more aggressive, so she always gets the first bite of food, which is fine unless Abby thinks it's hers, then watch out, Roxy! Roxy's butt stinks after she's been outside and Abby loves to sniff it, which really irritates Roxy, so she snaps at Abby. I swear, these two prima donnas are going to learn to get along or kill me in the process.