What Do Gerbils Eat? A Healthy Pellet-First Menu
What do Mongolian gerbils eat? Mostly pellets, though one UK welfare charity accepts a gerbil-formulated mix. Here’s why advice splits.
Table of Contents
🚨 Vet Now: Moist droppings, a soiled bottom, or a clear change in how much a gerbils eats or drinks needs a vet experienced with gerbils straight away, per the RSPCA.
Started on a pet-store seed mix, or a gerbil off its food? Jump to the switching section or the red flags below.
Mongolian gerbils, the usual pet gerbil, eat mainly pellets formulated for gerbils, with a few extras:
- Staple: pellets made for gerbils, per Merck and PDSA
- Extras: small pieces of fresh fruit or vegetable
- Treats: pumpkin seeds; sunflower seeds only rarely
Merck recommends keeping gerbils in pairs. Fat-tailed gerbils are a different genus; ask an exotics vet.
🩺 Health Note: This is general information, not a substitute for an exam by a vet experienced with gerbils. If your gerbil stops eating or seems unwell, see that vet straight away.
Pellets or seed mix? What the vet sources say
Sources split on this for Mongolian gerbils.
| Source | Leans | Key Detail |
|---|---|---|
| Merck Veterinary Manual | Pellets | Mixes get picked through |
| PDSA | Pellets | Avoid muesli-style mixes |
| RSPCA | Either | Pellets or a gerbil-formulated mix |
Why pellets come first
Merck’s gerbil care page and PDSA’s diet advice both warn about selective feeding: gerbils pick the tastiest pieces. We lead with pellets because Merck and PDSA do.
How to read the label
Merck cites 18–20% protein; WebMD gives about 14%. Check the bag names gerbils, then see our five-bag label comparison. A food labeled only for hamsters isn’t a gerbil diet, per Merck.
🔄 Outdated Advice: “Gerbils pick what they need from a mix.” PDSA says muesli-style mixes leave them without a balanced diet.
How much to feed a gerbil (and why the stash fools you)
For Mongolian gerbils, Merck gives about 5 g of pellets a day, and its professional entry says 5–8 g has been recommended. Bag labels may suggest more; the RSPCA says to follow the manufacturer’s guidance.
Scatter feeding and the stash check
Scatter food on the bedding, says the RSPCA, to reduce squabbling. Hoarding is normal, per Merck, so check the whole tank daily and remove stale food. See our tank setup for a pair and foraging ideas without a ball.
Fresh food and treats: what’s safe and how often
For Mongolian gerbils, PDSA says small amounts of fresh fruit and vegetables.
| Food | Source view | Key Detail |
|---|---|---|
| Pumpkin seeds | RSPCA, Merck list | Treat, not a staple |
| Sunflower seeds | Merck lists; RSPCA, PDSA caution | Fatty; rarely |
| Apple, pear, carrot, cucumber | RSPCA lists | Small pieces |
| Oranges | RSPCA lists; Omlet, Burgess caution | Sources split |
| Grapes | Some retailers list; RSPCA warns | Skip |
Merck’s professional entry calls sunflower seeds high in fat, and says gerbils on diets above 4% fat develop high blood cholesterol. Remove any uneaten fresh food.
Foods to skip, and what to do if your gerbil ate one
🚨 Vet Now: If your gerbil may have eaten grapes, rhubarb or another skip-list food, call a vet experienced with gerbils straight away; don’t treat it at home.
For Mongolian gerbils, skip grapes and rhubarb, which the RSPCA’s gerbil feeding guidance calls poisonous to rodents. We found no gerbil-specific toxicology, so treat grapes as a skip, not a proven poison.
🔄 Outdated Advice: Some retail guides list grapes as an ideal treat; the RSPCA says they are poisonous to rodents.
Tell the vet what was eaten, roughly how much, and when.
Gerbil won’t eat pellets? How to switch food gently
Merck says gerbils given pellet-and-seed mixes often pick out the seeds, so a Mongolian gerbil raised on a mix may ignore plain pellets at first. Some r/gerbil owners report refusal of one brand but not others; that’s owner experience, not research.
A gradual switch
The RSPCA says to avoid sudden dietary changes, which can upset stomachs. One manufacturer, Burgess, suggests blending old and new food over 7–10 days; follow the schedule on your bag.
Diet red flags: when to call a vet
🚨 Vet Now: Moist droppings, a soiled bottom, or a clear change in eating or drinking: call a vet experienced with gerbils straight away.
For Mongolian gerbils, the RSPCA says to monitor eating and drinking daily; an increase or decrease is a reason for a vet visit. PDSA notes overgrown teeth can need vet treatment.
Merck lists changes in the color, consistency, odor and amount of urine and feces as early signs of disease.
Gerbil diet FAQs
These answers apply to Mongolian gerbils.
1. What do gerbils eat every day?
Mostly gerbil-formulated pellets, per Merck and PDSA, plus small fresh extras and occasional seed treats.
2. Are pellets or seed mix better?
Merck and PDSA favor pellets because gerbils pick through mixes; the RSPCA accepts a gerbil-formulated seed mixture.
3. How much should a gerbil eat a day?
About 5 g of pellets daily per Merck, or 5–8 g in its professional entry; check your bag too.
4. Can gerbils eat sunflower seeds?
Only rarely: Merck’s professional entry calls them high in fat, and the RSPCA says too many can cause obesity.
5. What fruit and vegetables can gerbils eat?
Per the RSPCA, pear, apple, cucumber and carrot; PDSA says small amounts only. Remove uneaten pieces.
6. Can gerbils eat grapes?
No: the RSPCA calls grapes poisonous to rodents, and we found no gerbil-specific data either way. If eaten, call a vet experienced with gerbils straight away.
7. Can gerbils eat hamster food?
Not if it’s labeled only for hamsters; Merck says to always feed gerbil-labeled diets, so check the bag.
8. Do gerbils need water?
Yes: about 4 mL a day for an adult per Merck, but keep fresh water available daily.
10. Why does my gerbil hide food?
Hoarding is normal, per Merck; the RSPCA says to check the tank daily and remove stale food.
11. Do gerbils need mealworms?
Not necessarily: PDSA lists boiled egg and mealworms as treats, and Omlet calls them optional with gerbil-formulated food.
Your next step
Gerbils eat mostly gerbil-formulated pellets, a few small fresh extras, and seeds as occasional treats. If anything changes, call a vet experienced with gerbils.
✅ Do This: Check your bag names gerbils, then scatter a measured portion on the bedding and check the stash daily.
Next, see how big a tank a pair needs.
