I been having my norwegian forest cat which is a calico for 1 year 8 months. She is also spayed. She always went inside the litter box but stopped around the time when i took in a tuxedo cat from certain death being left to die outside my work (she was like under 1 week old when i found her). My oldest cat occasionally went outside the litter box. But ow she wont stop going outside. She runs in full speed around my living room leaving poop everywhere. She had been doing diarrhea so i took her to the vet couple days ago thinking she might had worms. The vet told me she had worms and gave her a shot and i need to take her in again in another week to get another one. She was pooping hard normal stool for the last couple days until yesterday and today where she pooped normal poop and also diarrhea in one go. What might be wrong with her? Is this a behavioral problem against my other little tuxedo cat since my calico doesnt like her a bit, always hissing and slapping her when ever she gets close.