Two mods to make the denizenpond less deathly. One excludes sprites and kois from being deathly.
The other one disables potentially deathly interactions from beeing done autonomously. Use separately or in combination.
This is a fairly straightforward mod. It allows your sims to go with and/or send their pets to rabbitholes to fulfill needs, learn new tricks, get supplies, go to the vet, and more. You can choose multiple pets.