In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
One of the greatest (affairs) that shows their danger is that they will remain and continue to exist until the day of judgement, because indeed they are the basis of every Fasaad [i.e. corruption] and Ifsaad [i.e. corrupting every affair by removing it from what it is supposed to be] in the earth- the basis of the spread of panic and undermining security in the land and the basis of every deviation from the true methodology, because they abandon knowledge and the scholars out of being deceived by their outward deeds. And due to this, the first thing Abdullaah Ibn Abbaas [radiyallaahu anhumaa] discredited them with was that there was not a single companion of Allaah’s Messenger [sallal laahu alayhi wasallam] amongst them and they are the original source of knowledge -neither permissible for anyone to emerge and be a position in religious affairs except through them nor acquire knowledge except from them, because they are the most knowledgeable regarding that which Allaah and His Messenger intend by way of the text. And that which is worthy that one should be aware of – in order to be acquainted with their danger – is that which Allaah’s Messenger [sallal laahu alayhi] wished if he were to meet them and what he described regarding what he will do to them, that he would slaughter them in a manner similar to the manner in which Aad and Thamood were slaughtered- even though they [i.e. khawaarij] are from the Ummah and from the people of the Qiblah, and especially when one recalls the statement of Allaah’s Messenger [sallal laahu alayhi wasallam] about dogs, that “Had dogs not been a community amongst the communities, I would have commanded that all of them be killed”. [Saheeh Al-Jaami 9452] Therefore, a sensible person compares and ponders regarding what the Messenger of guidance and mercy wished to do to these Khawaarij – despite their (devotion) in worship, prayer, fasting and recitation of the Qur’aan – as opposed to what he forbade himself and others from doing to dogs. Indeed, this is a great proof regarding the danger due to the continuation of this thought [i.e. Fasle Takfeer] and this type of people in the Ummah [i.e. the Khawaarij], because they weaken the Ummah and preoccupy it with [internal problems, strife etc]. [End of quote] (1)Read:https://salaficentre.com/2011/10/24/shaikh-fawzaan-the-methodology-of-ahlus-sunnah-in-their-combat-against-the-khawaarij/
A Brief Reminder From The Hadeeth
“Had dogs not been a community amongst the communities, I would have commanded that all of them be killed”. [Saheeh Al-Jaami 9452] Al-Khattaabee [may Allaah have mercy upon him] said: The meaning of this statement is that the Prophet [sallal laahu alayhi wassalam] hated that a community amongst the communities and a species amongst the creation would disappear until all of them cease to exist, because indeed there is not a creature from Allaah’s creatures except that there is some wisdom behind their existence and some welfare. So, when this is the case regarding this affair and there is no way of killing all of them, then kill the evil ones amongst them – the black ones- and leave the others, so that you benefit from them as guard dogs. (2)
NB: The others dogs which one is allowed to keep are: The hunting dog, the farm dog or the one utilised for herding livestock or the guard dog”.
Abdullah Ibn Umar [may Allaah be pleased with him and his father] said, “Allaah’s Messenger [sallal laahu alayhi wasallam] said, ‘Whoever keeps a dog, except a dog for herding livestock or a dog that is trained for hunting, two qiraats [i.e. great reward] will be deducted from his reward each day’”. [Reported by Bukhaari 5163 and Muslim 1574]
Imaam Muhammad Ibn Saaleh Al-Uthaymeen [may Allaah have mercy upon him] said: Due to this, if a house is located in the middle of the city, then no need of having a dog to guard it, therefore, to have a dog for this reason in such circumstances is unlawful and impermissible, and it takes away one or two qiraats from a person’s reward each day. However, if the house is located in the countryside and no is present, then it is allowed to have a dog to guard the house and the people residing in it. To guard people of a household is more important than guarding livestock or crops. (3)
[Ref 1: An Excerpt from Naz’atut Takfeer. pages 24-25]
[Ref 2: An Excerpt from Ma’aalim As-Sunan 4/132. slightly paraphrased]
[Ref 3: An Excerpt from Majmoo Fataawa Ibn Uthaymeen 4/246. slightly paraphrased]