The canary is apathetic, disinterested, and heavy and with little interested in performing event the simplest movements. You can also observe that the intestines are swollen, even if these symptoms can be due to different causes and the veterinary will determine the treatment.
Usually, the obesity is due to excessive feeding, and until it noticeably loses weight, it will be necessary to subject it to a strict diet consisting of green leafs and birdseed. When the canary achieves the adequate weight, diet will be increased as well as seeds but in adequate quantities.