The article implies but doesn't overtly state he has sex with animals. If you read the links, he doesn't have sex with animals. He role plays with dudes dressed like dogs.
That's weird to me and I don't get it, but there's a huge distinction between bestiality and what he does. I get it though, the article was looking to smear him and doesn't make that distinction, it purposefully implies he's banging animals.
There's are lots of (in my opinion) distasteful sexual sub cultures and fetishes, this isn't any different IMO.