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Hi this is Dr. Hill. How old is Minnie? Is she current on her vaccines and deworming?
Okay. that is important because in an older cat, I would have been more concerned with diseases, such as hyperthyroidism, renal disease, etc.
Many times you will not see worms in the stool unless it is an extremely large volume of worms. Has she been eating her normal amount of food? How long have you had the puppy? How long ago did you move?
Also, forgot to mention that cats that hunt will get parasites from their prey and need to be dewormed at least every 4-6 months
So, I would try to feed Minnie separately to get an idea of her intake. If the weight loss is dramatic then she should be seen by a local veterinarian as soon as possible. an over the counter dewormer will not cover a broad spectrum of parasites, so I recommend Profender.
She may be grouchy about the new puppy or because she is not feeling well. Best to get her checked to be safe.
Feel free to ask additional questions. If you are satisfied with my answer, then please take time to rate my response. Have a nice night. Take care