I want a command that makes all my dogs in the server stand at one point
You can modify the data of every wolf to be standing. i.e. Sitting to false.
/execute as @e[type=wolf] run data modify entity @s Sitting set value 0
To modify only your own wolves u can use the nbt selector and set the Owner to your own UUID.
This will modify all wolves owned by the player with the UUID of [I; -2075515819, 1863385350, -1758723883, 2055265572].
/execute as @e[type=wolf,nbt={Owner:[I;-2075515819,1863385350,-1758723883, 2055265572]}] run data modify entity @s Sitting set value 0