I have writers block :( please help?

It kinda depends on what aspects of euthanasia you are for. Are you for euthanasia just to cut the pet population back, which in my opinion is cruel, or is it because you want a humane way to put a pet down when they are suffering from a disease or illness that cannot be cured. Think about those two options, then from there start your essay with an opinion of your views on the subject.