I'm a bit skeptical.
The secretions of cane toad contain Bufotenin, which is psychoactive, but not in any "need to seek out" kind of way. I've had it in the form of the south American snuff vilca, and if prepared correctly (ie., not just licking a toad) it's interesting, but it would be hard to characterize as pleasant (nausea, muscle tightness, racing heart beat, headache, etc.).
I tend to believe the simpler explanations: they're dogs for fuck's sake, and dogs like playing with toads. I've had dogs that just couldn't help themselves, even if playing with those toads (normal, garden variety) make their mouths foam up like some looney-toons caricature of rabies.
So... I take that back. I'm not skeptical: I call BS,