activity stream for custom post type

hi
i have a dog custom post type that can add a dog update it update it and …

i want to make an acitvity stream for my action for example:

when add a dog or update a dogs image post acitvity in activity page

johny added to dogs

johny’s image updated

also there is live example : link

i just want to know how design database schema for this porpus and how handle save acivity