Complex Feedback/Data Forms

Are there any suggestions or best practices for creating a very complex data form? It will need to be either mulit-page or section, it will be a very complex form. Should I find a specific plugin for this purpose or is there something within highend that will fit the bill? The form in question is an application for pet adoption and will contain close to 100 data fields (if we use it in the current form)

Thanks for your insight,
Christine