The general theory of relativity (GTR) has been successful in describing some aspects of Cosmology. However, some problems remain, in particular dark matter is not explained. It is possible that there is a connection between the presence of dark matter and the physics of black holes and that both gravitational phenomena can be explained by the same mechanism. Here we use a previously published dynamic form of Newtonian advanced gravity termed DNAg, which resolves the presence of dark matter. Firstly, it explains the presence of cosmological dark matter, it can explain the presence of dark matter at the centre of the galaxy, and it can be used to explain the presence of dark matter in the galactic halo. By the same token it obviates the infinite density singularities formed in black holes. Moreover, it has been corroborated in neutron stars, and is corroborated by black hole studies. Importantly, it offers further predictions for the presence of cosmological dark matter and by the same token for black hole physics, which will be readily testable using the newly commissioned event horizon telescope.