This macro will cast Mend Pet when in combat and Feed Pet when out of combat. It also tells you how to feed by bag slot items, food for specific pets, and other various macros for your world of warcraft hunter.
Feed by food name.
/cast [nocombat] Feed Pet; [combat] Mend Pet /use [nocombat]
-OR-
Feed by bag slot: bag #1 slot #13.
/cast [combat] Mend Pet; [nocombat] Feed Pet /use [nocombat] 1 13
-OR-
Feed a certain food item depending on the type of pet.
/cast [pet, nocombat] Feed Pet /use [pet:Cat/Ravager, nocombat] ; [pet:Wind Serpent, nocombat]
-OR-
Hold down alt to cast Mend Pet out of combat, and shows the amount of food you have in your bags.
#show /cast [modifier:alt][combat] Mend Pet; [pet, nocombat] Feed Pet /use [pet, nocombat, nomodifier:alt]