In the Abstract section, there is an error in the fifth sentence. The correct sentence is: To address this knowledge gap, sixty dogs of both sexes will be randomly assigned to three groups: (i) melatonin only group (3 mg/dog, n = 20); (ii) PBM only group (diode laser, wavelength 660nm, 100mw power, with 3 J/point, 2 sessions/week for 3 months, n = 20); (ii) PBM + melatonin group (n = 20).

In the Experimental groups subsection of Materials and Methods, there is an error in the first and fourth sentences. The first correct sentence is: Sixty dogs (n =  60) will be randomly assigned in three different groups: (i) melatonin +  PBM simulation (n =  20) where melatonin will be administered orally at 3 mg/dog every 12 hours for 3 months. The fourth correct sentence is: During the procedure, the four infrared laser diodes will remain offline and thus a total power of 400mW from red laser will be delivered.; (iii) PBM +  melatonin (n =  20) where melatonin will be administered orally at 3 mg/dog every 12 hours.