Vets will tell people their overweight dog is healthy all the time. You should actually be able to see their ribs slightly and there should be quite a bit more tuck on their waist  than that.

https://preview.redd.it/4lgg220a6ooe1.jpeg?width=2560&format=pjpg&auto=webp&s=aefbdab525fb3eeaea41dc768e7a5fb661d327ad

Your mastiff looks like it sits about a 6 or a 7 on this chart when in reality a 22month old dog should be about 4-4.5 on this scale. Lower food intake and increase the exercise. Your dog is fat