I haven't tried this toy anally, but it gets really big after the bend and the bend will keep anything from getting sucked in so you're safe for using this as an anal toy. It's silicone so it should be able to be sterilized (boiled, 10% bleach solution) after anal play if you want to use it in the vagina again.
Anything can be used for anal play as long as you're careful. One way to make vibrators safe is to make sure they have a flared base so they don't get sucked in. You can use these Enhancers
to make any regular vibrator without a flared base into a safe anal play toy.