He who kept a dog which is neither meant for hunting nor for watching the anitmals nor for watching the fields would lose two qirat every day out of his reward; and there is no mention of the fields in the hadith transmitted by Abu Tahir.
Sahih Muslim Book 22, Hadith 69
← Previous Hadith He who kept a dog ther than one meant for watching the fields or herds or hunting would lose one qirat every day out of his reward (with God).

Sahih Muslim Book 22, Hadith 68 Next Hadith → He who kept a dog except one meant for watching the herd, or for hunting or for watching the fields. he lost two qirat of reward every day. Zuhri said: The words of Abu Huraira (Allah be pleased with him) were conveyed to Ibn Umar who said: May Allah have mercy upon Abu Huraira; he owned a field.

Sahih Muslim Book 22, Hadith 70