It does not appear that Negative Energy Burst heals those companions summoned with the Necromancy System. It simply casts and nothing happens to them, no ill effects or positive.
I'd like to suggest that there might be an NPC somewhere that would be willing to trade in full charge healing wands for higher grade ones.
Two Light Healing Wands would trade for One Moderate Healing Wand.
It might not be an issue later down the line, but I figure it might be a worthwhile way to trade out some of the weight of the wands when their usefulness starts to dry up. I know that they can be made, but it's just an alternative to people who may not have the funds as well.
Just as the title says, the summoned variety of Animal Companions by the Druid class is not considered a companion by the Companion Chat Commands.
Pretty self explanatory, tried to tame some different animals out in the wild, playing as a druid, but whenever I tried to use the .compantame ability, it would constantly tell me I needed to be a Ranger/Druid to be able to use the ability. I was able to successfully animal empathy them, but yeah.