There are a couple of quiet roads practically devoid of traffic where you can go walking with the dog. There are jungle trails as well if you are more adventurous.
I've taken my 2 Shih Tzus to Genting before but only able to walk them around the more quiet roads. Can't go into hotels/cafes/restaurants but it was good because of the weather. they enjoyed it a lot.
And there's a chinese restaurant (only one I went to that day anyway) in Gohtong that allows dogs. Can't recall the name but it is famous for their freshwater prawns glass noodle soup.