This is an article about a woman who had to give up her cat because her son was severely allergic. I think she was as responsible as she could be - her son was suffering, and she had found a new home with her brother.
What DOES bother me though are the people who still think that just in 'case' a child is allergic, an animal should be tossed out of the house. I remember a couple who came to adopt a cat. The then-fiancee was obviously less interested in the cat but was agreeable to the adoption. Things got worse after they got married - and the minute they had a baby, the cat was tossed out. Not because the baby was allergic - just because it was a cat and it had to go.
People often wonder why it is that children seem more allergic these days than in the past - as many of you know if you've been reading the blog long enough, I think it has to do with desensitisation. Farm studies seem to back this up.