Cat came from my aunt’s about 11-12 days ago and lost over a pound.

The cat may have lost weight from stress adjusting to the new home, lowering appetite and intake. Or food issues reduced its digestion and absorption, or meat-protein intake was insufficient – feed quality pet food with fresh meat as supplement.

Disease is also possible, such as parasite infection with signs like weight loss, diarrhea, and soft stool. If signs are unclear, sudden severe weight loss may be stress-induced FIP after the move – get a checkup.