Is it possible to do a heart connection or a harmonization for people and their companion animals to promote living side-by-side peacefully? Was my recent request successful?

This is very possible and is a good idea in the same way it is a good idea to help humans reconnect. Humans and their companion animals and those around them, when they are living in close proximity, are best served by being in a state of peace and harmony. When there is friction and discord, this acts as a disservice to all and will be harmful to the animal as well as the humans in that environment. Your recent foray into this new undertaking was indeed successful as you will hear if you contact the family. This was the icing on the cake, so to speak, and was truly inspired. You have gone above and beyond the call of duty here to bring in the extra benefits of having a re-connection for the two warring parties in a way that will right the wrongs of the past and stabilize things beautifully. You did quite well in doing this, and this as well can serve as an example for the future that many things are possible in working with the companion animals to make life better for them and also to help their mission along, as they are here to serve their people and that includes all humans, not only the direct owner. There is a desire to help that is always seeking expression. When they are out of alignment and are aggressive, for example, this is because something has happened to undermine them in some way. To be sure, there are instinctual responses that pertain to keeping an area safe, their domain, their special turf, and particularly, the safety of the pack being a paramount consideration, as these are indeed pack animals and will serve their genetic mandate to help their brethren to stay safe. Anything that threatens the potential well-being of the pack will arouse them and they will respond accordingly. But beyond those considerations, especially as happens with strangers intruding, when there are issues of compatibility there is almost always a karmic thread behind the discord that can be healed in some way and this will benefit all involved.