Dataset of the work Smart sensory polymer for straightforward Zn(II) detection in pet food samples

•Fluorescence sensory polymer film toward Zn(II).•Dipping the films in water with Zn(II) turn-on its fluorescence.•A picture taken to the sensory polymer allows for the quantification of Zn(II).•The Zn(II) content of commercial pet food was measured.•The use of the sensory film and proposed methodology saves time and costs.