I had to buy dog of hell, never appeared. I got before koh than him.

Use your summoning points to purchase him? Its only like 12k or something.

Just luck of the draw. I've been here since late 2016 and got both eight-span bird and rhino for the first time a month or so ago. Even with all the daily free draws and the bi-weekly 20 draws it was just dupes for over a year. If it frustrates you enough you can buy them, or continue to draw and just work around using them until your luck changes.

Just bad RNG. The cat was the last summon I got on my main account. Where as it was one of the first few I got on 2 other alt accounts. There is always at least 1 that will take your forever to pull.