How rare is TRex?
At the listed 1 in 10T chance, this is how many hatches give you a 50, 90 or 95 percent chance of at least one TRex:
| Chance of at least one | Hatches |
|---|---|
| 50% | 6.93T |
| 90% | 23T |
| 95% | 30T |
Eggs in Ride A Pet carry their own Luck value, and weather and boosts change it too. No source we read explains exactly how Luck combines with the listed odds, so treat these numbers as the baseline.
Which egg hatches TRex?
No egg is called the TRex Egg. TRex hatches from ordinary map eggs once your total Hatch Luck reaches its 1 in 10T figure, according to the luck model two guides describe. These eggs need the least ranch luck for it:
Volcanic Egg (2.5T luck): ranch luck ×4
Cherub Egg (1T luck): ranch luck ×10
Solaris Egg (300B luck): ranch luck ×34
Black Hole Egg (100B luck): ranch luck ×100
Bloom Egg (2B luck): ranch luck ×5K
It is also in the Robux Dragon Egg at a fixed 15% per roll.
Reaching the threshold makes the pet possible, not likely: no source says how often it hatches after that. Work out your own egg in the hatch luck calculator.
Should you fuse TRex?
The Fuse Machine takes any four pets of Legendary rarity or higher, so TRex qualifies. Fusing it removes $50K/s of base ranch income, more if it has a mutation or trait. Whether a fusion is worth it depends on the chance the preview shows for the pet you want; the calculator works that out.
Compared with the pets around it
- Flamingo is the next easier hatch (1 in 5T).
- Phoenix is the next harder hatch (1 in 30T), earning $100K/s with 1M base speed against 266K.
Sources
- Ride A Pet Fandom wiki: Pets (page revision of 4 Oct 2026)
- TechWiser: Ride a Pet all pets index (updated 30 Sep 2026)
- Bloxodes: All 30 Ride A Pet pets (updated 19 Sep 2026)
- BloxB: All Ride A Pet eggs and pets (20 Sep 2026)
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