Is "Guard" working as intended?
It has only 15 sec base cooldown, so I think you can use it every 15 secs to gain the effects.
I don’t use it myself, but I’d imagine it being good for dungeons and zerg vs zerg fights in WvW.
WvW Roaming with Mesmer
I suppose the original idea of the skill was to stealth your pet, making ambush against other players unaware of its presence.
The pet will remain in the location for 180 seconds or until you go far than 3000 units, call it back, use a shout, or start a fight (at the end of the fight the pet will return to the previous position, waiting).
The pet gain stealth and protection for 10s every time you use the skill, it not regain those buffs until the skill is used again.
Actually the major use of this skills is in conjunction with the trait “Nature’s Voice” which give regen and swiftness for your team everytime you use a shout, in canjuction with “guard” a ranger can make those boons almost permanent for the entire party.