I got a PM asking for my source on the dog-cancer link, unless it happened to be in Norwegian. I thought the answer might interest more gals out there, especially since it corrects some possible misinformation. So here's the reply I sent to the PM:

*****
Yep. In Norwegian. Also ... no link. Furthermore ... in searching for a link to the original source, I found that one key premise is wrong. There's plenty on the net about cats getting breast cancer. But the premise may yet hold up if cats get a different KIND of bc. I didn't open up those links to check, nor am I sure I would have understood them if I had. Anyway, here's the original little text in Norwegian, and my English translation.

PRØV EN PUS
Kan hundehold gi brystkreft? Det undrer tyske leger på, etter å ha spurt 1320 pasienter om de hadde hund. Det viste seg at kvinner med brystkreft langt oftere hadde hund enn kvinner uten sykdommen, ifølge Medical Hypothesis. Hunder kan få brystkreft, og sykdomsforløpet likner på det man ser hos oss. Kanskje blir noen former for brystkreft utløst av et virus som går både på mennesker og hunder. Katter, derimot, blir ikke rammet av brystkreft. Så kanskje Pus bør ta Trofasts plass?

TRY A PUSSYCAT
Can dog ownership cause breast cancer? That's what German doctors wonder, after having asked 1320 patients whether they had a dog. It turned out that women with breast cancer far more often owned a dog than women without the disease, according to Medical Hypothesis. Dogs can get breast cancer, and the course of the disease resembles what we see in humans. Perhaps some forms of breast cancer are triggered by a virus that attacks both humans and dogs. Cats, on the other hand, are not struck by breast cancer [sic]. So maybe Kitty should take Fido's place?