Donkeys have been banned from entering Kenya's north-eastern town of Wajir unless they wear nappies.
Officials say the rule is to protect the town's newly laid tarmac road.
A letter told donkey-cart owners they must manage their animal's faeces "to avoid poop all over the tarmac road creating nuisance".
The authorities in Wajir, which is more than 600km north-east of Nairobi, want to protect the new tarmac road after waiting decades for such a development.
The new road was built last year and is 27km long.
The nappy notice was issued on Monday and came into affect on Thursday.
"[The county government] appreciates the contribution of the donkey-cart operators to the economy of Wajir ... However the town must be kept clean at all times," it says.
"In view of the above you are directed to manage your donkey poop (faeces).... No donkey will be allowed in town without this poop-collecting bag."