My little feline heartbreaker who came home last nite, seems perfectly happy, healthy, and active, but she's had several unformed stools over the past 24 hours. She goes in the litter box, no accidents, and they're not liquid or mucous laden. She was prophylactically treated for parasites, etc. one week ago. Are the unformed stools usually a sign of a GI problem or could it be the "stress" of a new environment and a slightly different diet? I guess the bottom line is: how long to observe her until I take her to the vet?