I bet some of us still don't understand about this matter.So, Please read about your religion and understand it before start patronizing people, for each finger you point it at people, there are four others pointing at YOU!
Radical thinking only gives the wrong idea about Islam, even though Islam is lovely and peaceful, just by mentioning the word it self you could scare off 50% of humans on earth, the reason? RADICALISM, this is not the right way to spread the word of PEACE = ISLAM.
Let's clarify the matter of dogs in 2 points: A) OWNING a dog, B) TOUCHING a dog.
As for Owning a dog, it's Haram unless for the necessary reasons that's allowed by Islam, such hunting, farming, and cattle control, otherwise the dog owner will lose a carat or two"big mass unit" of his good deeds for everyday with the dog,
فعن ابن عمر رضي الله عنه قال : سمعت رسول الله صلى الله عليه وسلم يقول : ( من اقتنى كلّباً إلا كلباً ضارياً لصيد أو كلب ماشية فإنه ينقُص من أجره كلّ يوم قيراطان ) رواه البخاري (5059) ومسلم (2941) ، وفي رواية لهما ( قيراط )
BUKHARI & MUSLIM:
"Who owns a dog, unles for hunt or cattles, will lose of his good deeds every day two carats"
So it's clear that dogs are najis and we are not suppose to keep them for no real purpose such as hunting or protection.
B) Touching dogs:
If the touch was dry = dry hand and the area touched on dog is dry, in this case its NOT najis. But if the touch was wet, whether its from mouth saliva or urine, then its Najis in this case and must wash the touched area by the very famous method of seven times ONE of them by sand.
أبي هريرة رضي الله عنه عن النبي صلى الله عليه وسلم : ( إذا ولغ الكلب في إناء أحدكم فليغسله سبع مرّات إحداها بالتراب ) ، والأحسن أن يكون التراب في الغسلة الأولى . والله أعلم .