Check this thread:
Macros: Essential Information
For your specific macro, try this:
#showtooltip
/use [@player,pet:Shale Spider]Master's Call;[@player,pet:Spirit Beast]Spirit Mend;[pet:Devilsaur]Feast;[@player,pet:Feathermane]Slow Fall
Swap the Feathermane and Slow Fall with the pet family you are using (there are a few with that ability, some exotic) and the name of their ability.