* Animal Crossing: Animals in Animal Crossing are essentially immortal. They can get sick or grumpy, but they never actually die. They can move away from your town, but this is more like a "retirement" than death.
* Nintendogs/Cats: These games allow you to raise virtual pets. While your dog or cat can age and become more frail, they don't die in the traditional sense. They may become less active or require more care as they get older.
* Other Games: In some games like Pokémon, your companions can faint in battles but they can be revived. In others, they may be permanent companions that never die.
So, to summarize:
* Most Nintendo pets are designed to be permanent companions. They may age and require more care, but they don't actually die.
* There are some exceptions where pets can "die" in the game, but it's usually more of a temporary state or a move away than a permanent death.
If you're curious about a specific game, let me know and I can tell you if their pets can die!