Just ask yourself how much suffering your donation will cause to helpless animals
Many people are unaware that some major charities experiment on animals. There are other charities that experiment without animal cruelty.
Mark Twain couldn't have put it any better.
"I believe I am not interested to know whether Vivisection produces results that are profitable to the human race or doesn't. To know that the results are profitable to the race would not remove my hostility to it."
http://www.peta.org.uk/cmp/viv-charlist.aspThere is a lot of information on animal-friendly alternative on Dr Hadwen site. Particularly the "Not in my name" campaign. People suffering illnesses who are against animals suffering in the attempt to find a cure.
http://www.drhadwentrust.org/get-active/not-in-my-name