The winner and still champion is...

The Dogs (Coronet Books)

I bought The Dogs after randomly opening the other three. I opened Bamboo Hell and it had 2 different racial slurs in 2 pages. I opened Venetian Vendetta and it had "Lucia, you slut." I opened Orca and it had an orca miscarrying.

...I forgot to racism/sexism/orca miscarriage spot check The Dogs. For all I know it contains all three.