Yeah, looks like a normal weight even for a chihuahua is above 1.5 kg (dogslim.com/articles/dog-weight-chart.html), with grey-headed flying foxes (the largest Australian bat) weighing typically less than 1 kg (en.wikipedia.org/wiki/Grey-headed_flying_fox). It’s maybe possible their ‘leg-span’ - excluding wings - could be similar, though? No idea.