If Terri was bulimic, I find it odd that Michael had no idea. My husband's ex-wife was bulimic. He was only 25 when he figured it out and made her go for treatment.
I've interviewed many people who had loved ones who were bulimic. It often takes years and years for them to catch on to the bulimic behavior.
Well, Mikey could have just saved time and sent her to the same veterinarian who (allegedly) agreed to euthanize Terri's pet cats for expediency. Perhaps the vet would have been offering a three for the price of one special that day.