Ohh My Dog follows the heartwarming and emotional journey of two loyal dogs and the extraordinary bond they share with their owners. In Dibrugarh, Assam, a young boy named Apu (Mahi Rai) lives happily with his beloved pet dog, Momo, and his parents (Geeta Agarwal and Prashant Kashyap). Their world is turned upside down when Momo mysteriously disappears. Despite seeking help from the local police, SHO Mohd. Yusuf Hazari (Vijay Mishra) dismisses the case, suspecting that Momo has fallen victim to a gang involved in the illegal dog meat trade. Refusing to lose hope, Apu embarks on a determined search to reunite with his faithful companion.

Meanwhile, in Patna, Bihar, the tables are turned when Oscar, another devoted dog, finds himself searching for his master, Prince (Nikhil Kumar), an underage construction worker who has been kidnapped. Oscar's relentless efforts alert the workers at the construction site, who seek assistance from Prince's teacher (Pankaj Tripathi). However, they too are met with indifference from the local police officer (Rajesh Kumar). As the two parallel journeys unfold, the film explores themes of loyalty, courage, and the unbreakable bond between humans and their canine companions, leading to an emotional and inspiring climax.