my female piggy Prima is about 4.5 years old and a couple months ago she started to lose weight. i brought her to the vet and we discovered she had an upper respiratory infection and a lump on her neck. after that, she gained the weight she lost with critical care. its about two months later and these are her recent weights (on the same scale):

as you can see, its been a rapid weight loss in a very short amount of time. ive been feeding her critical care 2 times a day (a tablespoon each time) and the oxbow multivitamin. i also switched her back to the “colorful” food which i raised her on after trying the oxbow pellets. she seemed to not eat these at all so thats why i switched back. i feed her veggies multiple times a day and she drinks her water. she hasnt lost interest in food or water, however shes a bit lethargic, kind of like when she had her URI. I'm bringing her to the vet tomorrow but is there anything i can do? do i lose hope? ive been giving her critical care for weeks now and she continues to lose.... the lump on her neck hasnt grown either so I'm at a loss. she seems pretty happy too, she purrs and wheeks and interacts with her cagemates. should i prepare for the worst when i bring her to the vet? i didnt bring her for so long because i was waiting to see if she would gain weight but she hasnt. please, any advice, whether it be foods for gaining weight or just keeping her comfortable, would be enormously appreciated.

as you can see, its been a rapid weight loss in a very short amount of time. ive been feeding her critical care 2 times a day (a tablespoon each time) and the oxbow multivitamin. i also switched her back to the “colorful” food which i raised her on after trying the oxbow pellets. she seemed to not eat these at all so thats why i switched back. i feed her veggies multiple times a day and she drinks her water. she hasnt lost interest in food or water, however shes a bit lethargic, kind of like when she had her URI. I'm bringing her to the vet tomorrow but is there anything i can do? do i lose hope? ive been giving her critical care for weeks now and she continues to lose.... the lump on her neck hasnt grown either so I'm at a loss. she seems pretty happy too, she purrs and wheeks and interacts with her cagemates. should i prepare for the worst when i bring her to the vet? i didnt bring her for so long because i was waiting to see if she would gain weight but she hasnt. please, any advice, whether it be foods for gaining weight or just keeping her comfortable, would be enormously appreciated.