In addition to clinical PDT applications regarding antimicrobial and antineoplastic activity, photodynamic reactions have also been used in several other practices such as for fish tank decontamination, water treatment, antiangiogenic therapy for age-related macular degeneration, decontamination of surfaces, and even inactivation of pathogens for blood transfusion. Nowadays, not all potentials of photodynamic reactions are commercially available yet, but they definitely deserve to be highlighted in this chapter as alternative applications of photodynamic reactions in veterinary medicine.