How can i cast alacrity on my pet , using his name does not works, may be there is a way to bypass this problem using a command that would be useability-on-playerpet. Also wondering how do i cancel FD (either my own FD death parlor, or a SK/Monk one), Looking for it in the buf windows sometimes takes too long.
For feign death use your stand command key; mine is 'x' which I believe is the default. For the buff, add a line to your macro with "target Petname" (with your pet's name) or "target_pet 0" BEFORE the line to cast the buff. The target_pet has the advantage of not having to be updated if you ever change your pet's name.
There's a target_previous command. They are all on the wiki at http://eq2.wikia.com/wiki/Slash_Commands I don't use the target_group_pet command for my own pet usually as the target_pet works. I am not certain now why I used target_pet 0 on the one character I looked at since target_pet works as well. I usually actually just use the pet's name in any case. (edit to add more on target_pet)
Normally you press the grave (the key on the upper left with ~/`) to target your pet. This is controlled on Options > Targeting Keys Select Pet. To select a group member's pet, it's shift+F2, shift+F3, etc. That's also configurable in Options > Targeting Keys. To cancel FD, hit "x".