I don't see a photo Kitchen Cottage, but if they look like Kunekunes I can begin to imagine

There's no quick way to get them to drop the pounds (not that I know anyway

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Even complete starvation (which you wouldn't want to do anyway) it would likely take them 2-3 months to lose it.
The thing about Kunekunes is in the past they were used by sailors when going on long voyages. They used to feed them up so fat that their skin was almost splitting, then take them to sea where a handful of scraps would keep them fed. They lived off their fat reserves and by the time all the other food had run out, they were slim enough to slaughter and eat. (from the last KK newsletter

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Plenty of space, if they are over 9 months or so they could go without hard feeding, but a handful of nuts might not be a bad idea (just so they learn to come to you) and fruit & veg and a bit of hay or hayledge that should keep them full without putting on any more fat. And willing volunteers to play football with them will help burn the calories too

HTH
Karen
