She has a very healthy appitite but has lost 8 oz. & is down to 1 pound. I had her to the vet & she is being treated for parasites plus on an antibiotic. I also ordered some unprocessed oat groats to help her gain weight. Now she has been chewing on her cage bars. Does anyone elses piggie do this? Is she lacking something? She does have her chew sticks, vitamins, good food, veggies & fruits. She is 4 1/2 yrs. old. What can I do?