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The paper overviews the behaviour of dipolar magnets with tetragonal lattice characterized by the ratio r = c/a reflecting the measure of tetragonal distortion of the crystal structure. It is shown that in zero magnetic field the dipolar systems with sufficiently large r despite the long-range character of the magnetic correlations can be mapped to two-dimensional Ising model with the nearest-neighbour interaction only. The magnetic properties of dipolar magnets with r ≥ 2 are described by reviewing the results obtained primarily on rare earth (R) dipolar magnets from the RBa2Cu3O7-δ and AR(MoO4)2 series (A = Cs,K).