> For the complete documentation index, see [llms.txt](https://xtop-pet.gitbook.io/xtoppet-whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xtop-pet.gitbook.io/xtoppet-whitepaper/pet-system/pet-upgrading/auto-upgrade-through-feeding.md).

# Auto-upgrade through Feeding

Pets can be upgraded by regularly feeding them, with the required food energy accumulated over set days. Players must ensure pets receive sufficient energy within these days to automatically upgrade to the next level.\
Upgrade Requirements Table:

| **Pet Level** | **Upgrade Days** | **Required Food Energy** |
| ------------- | ---------------- | ------------------------ |
| Lv1→Lv2       | 1                | 0                        |
| Lv2→Lv3       | 3                | 750 (250 per day)        |
| Lv3→Lv4       | 4                | 1200 (300 per day)       |
| Lv4→Lv5       | 5                | 1750 (350 per day)       |
| Lv5→Lv6       | 6                | 2400 (400 per day)       |
| Lv6→Lv7       | 7                | 3150 (450 per day)       |