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Here we present new - and, nevertheless, last - mid-infrared (mid-IR) datafor supernovae (SNe) based on measurements with the Spitzer Space Telescope.Comparing our recent 3.6 and 4.5 $\mu$m photometry with previously publishedmid-IR and further multiwavelength datasets, we were able to draw someconclusions about the origin and heating mechanism of the dust in these SNe orin their environments, as well as on possible connection with circumstellarmatter (CSM) originating from pre-explosion mass-loss events in the progenitorstars. We also present new results regarding both certain SN classes and singleobjects. We highlight the mid-IR homogeneity of SNe Ia-CSM, which may be a hintof their common progenitor type and of their basically uniform circumstellarenvironments. Regarding single objects, it is worth highlighting the late-timeinteracting Type Ib SNe 2003gk and 2004dk, for which we present the first-evermid-IR data, which seem to be consistent with clues of ongoing CSM interactiondetected in other wavelength ranges. Our current study suggests that long-termmid-IR follow-up observations play a key role in a better understanding of bothpre- and post-explosion processes in SNe and their environments. While Spitzeris not available any more, the expected unique data from the James Webb SpaceTelescope, as well as long-term near-IR follow-up observations of dusty SNe,can bring us closer to the hidden details of this topic.

Spitzer's Last Look at Extragalactic Explosions: Long-Term Evolution of Interacting Supernovae