Answered by Shaykh Faraz Rabbani
What is the bare minimum to have a shirt considered tahir after a dog has brushed against it? if I have washed a shirt several times in the regular wash, does this make it taahir, or do I have to wash it 7 times, one time with dirt? AND, what about all the clothes and suitcases this shirt has touched? do they ALL need to be cleaned?
Answer:

Walaikum assalam wa rahmatullah,
In the Hanafi school, the saliva of a dog is filthy, not its skin or hair. [Multaqa] As such, mere ‘brushing’ of a dog against one’s clothes does not render them filthy.
If a dog’s saliva comes onto one’s clothes, one must simply wash the affected area itself, until there is no readily-removable trace of the saliva left (such as by pouring water over the affected area three times, or placing it under a running tap). [Maraqi]
And Allah alone gives success.
Faraz Rabbani.
