If you are sharing the pond with a neighbor, then I think your next step is to meet your neighbors (always a good idea) and discuss your goals for the pond AND their goals for the pond.
The more things you can do in agreement, the better. (There are probably also some Texas laws concerning shared ponds.)
If their goal is just watering their cattle, then there are lots of things you can still do on your side. However, there are some things that are prohibited. For example, some of the pond herbicide labels say things like, "No watering livestock for 48 hours."
Have fun on your new projects!
