My neighbor suddenly walked inside our fence and our dog bit him am I rude for not helping him anymore?

My neighbor just walked inside our fence and our dog suddenly attacked him. We never invited or tell him to get inside our fence its also tresspasing now we gave him $20 for treatment because thats the only price in our country now his wife is asking another money $10 for his treatment I told her we no longer would want to help him because what he did is tresspassing and no we didn't even invite him to enter plus its been 2 mos since that happened and it should be half not just us who would shoulder the expenses because its his fault to tresspass. So why they are still asking money when in the first place its his fault to tresspass our house. Am I rude for telling his wife that?
My neighbor suddenly walked inside our fence and our dog bit him am I rude for not helping him anymore?
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