To study the effect of metallicity on the mass-loss of AGB stars , we have conducted mid-infrared photometric measurements of AGB stars in the Sagittarius and Fornax Dwarf Spheroidal Galaxies ( [ Fe/H ] =-1.1 and -1.3 ) with the 10-micron camera of VISIR at the VLT .
These observations combined with previous near-infrared photometric measurements allow us to estimate mass-loss rates in these galaxies .
We show here that the observed AGB display dust-driven mass-loss .
Dust mass-loss rate are found to be in the range 0.2 \times 10 ^ { -10 } -1.3 \times 10 ^ { -8 } M _ { \odot } yr ^ { -1 } for the observed AGB stars in SgrD and around 5 \times 10 ^ { -11 } M _ { \odot } yr ^ { -1 } for the observed star in Fornax .