  A $d$-dimensional ferromagnetic Ising model on a lattice torus is considered.
As the size of the lattice tends to infinity, two conditions ensuring a Poisson
approximation for the distribution of the number of occurrences in the lattice
of any given local configuration are suggested. The proof builds on the
Stein--Chen method. The rate of the Poisson approximation and the speed of
convergence to it are defined and make sense for the model. Thus, the two
sufficient conditions are traduced in terms of the magnetic field and the pair
potential. In particular, the Poisson approximation holds even if both
potentials diverge.
