A chick whose toes curl under so she walks on her ankles — or can’t stand at all — most often has curled toe paralysis, a riboflavin (vitamin B2) deficiency, and caught early it’s one of the most fixable problems in chick keeping. The catch is speed and telling it apart from its look-alikes: spraddle leg, injury, and the neurological problems that make a chick stumble or walk backwards. This guide sorts them out the way I’ve sorted them for readers for seventeen years — by what you actually see.
Quick Facts
| Classic sign | Toes curled inward/under, chick walking on hocks or “knuckles” |
| Cause | Riboflavin (vitamin B2) deficiency — feed or breeder-hen diet |
| Fix | Poultry vitamin drops with B2, start same day — days matter |
| Look-alike #1 | Spraddle leg: legs splay sideways, toes normal — different fix (hobble) |
| Look-alike #2 | Stumbling/backwards walking: vitamin E/selenium or brain issue |
| Prevention | Fresh quality chick starter — B vitamins fade in old feed |
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What Curled Toe Paralysis Looks Like
The name is the description: the chick’s toes curl inward and downward, like a loose fist, and she starts resting and walking on her hocks (the “ankle” joints) instead of her feet. Early on she can still get around, awkwardly; left alone, the legs weaken, she goes down onto her hocks full-time, and eventually can’t reach food and water. It usually shows up in the first one to three weeks.
The cause is a vitamin shortage, not an injury or infection: riboflavin (B2) keeps the nerves serving the legs healthy, and chicks burn through it fast. It runs out two ways — the feed (stale, poorly stored, or homemade starter; B vitamins degrade with age and heat) or the egg (a breeder hen who was herself short on B2 hatches chicks with no reserve — why it sometimes hits several chicks from one hatch).
The Fix: Vitamins, Today
Speed is everything — nerve damage becomes permanent if the deficiency runs for long.
- Get a poultry vitamin supplement with riboflavin into her today — poultry vitamin drops or a vitamin/electrolyte water pack from the feed store. Dose per the label, directly by drop to a weak chick, then in the drinking water.
- Treat the whole hatch’s water — if one chick ran short, her brood-mates are on the same feed and the same egg reserves.
- Replace the feed with a fresh bag of quality chick starter. Check the mill date; buy amounts you’ll use within a few weeks and store it cool and dry.
- Support her while the nerves recover: keep her where she can reach food and water without competing, on grippy footing (paper towel or rubber shelf liner, never slick newspaper).
- Expect improvement within days in a fresh case. Caught early, most chicks recover fully. A chick treated late may keep some curl — some manage fine, some don’t. Give a treated chick a week of honest improvement before making harder calls.
For a badly curled older chick, some keepers add a gentle “sandal” — toes taped flat to a tiny cardboard sole for a few days while the vitamins work. Useful, but it’s the vitamins doing the curing; the sandal just holds shape.
The Look-Alike: Spraddle Leg
Readers constantly write me about a “chick that can’t stand,” and the first fork in the road is which way the legs fail. Toes curled under, walking on hocks → curled toe paralysis, above. Legs splayed out sideways like a split, toes normal → that’s spraddle leg, a different problem with a different fix: it comes from slick brooder flooring (or a crowded hatch), and the treatment is a soft hobble — a band-aid or vet-wrap loop holding the legs a normal width apart for a few days — plus grippy footing for everyone. Full walkthrough in the spraddle leg guide. Spraddle leg caught in the first days fixes fast; the same slick-floor prevention stops both new cases and repeats.
Stumbling, Circling, or Walking Backwards
The strangest chick question I’ve been sent — a chick walking backwards — belongs to a third family: neurological signs. A chick that stumbles, tips over, tucks or stars its head back, circles, or walks backwards is showing brain-and-balance trouble, not leg trouble, and the usual suspects are:
- Vitamin E/selenium deficiency (“crazy chick disease,” encephalomalacia) — same treatment logic as curled toe: a poultry vitamin supplement containing vitamin E and selenium, started immediately, plus fresh feed. Some recover well if caught fast.
- A head injury — brooder knocks happen; give quiet, warmth, and vitamins, and many bounce back in a day or two.
- Marek’s disease in older chicks (usually 6+ weeks) — progressive one-sided paralysis, the classic one-leg-forward-one-back split. No treatment; vaccination at hatch is the prevention.
The honest triage: any wobbly-headed chick gets vitamins and a safe quiet corner today, because the treatable causes are time-sensitive and the vitamins can’t hurt. A chick that declines anyway despite fresh feed and vitamins is likely beyond home fixing.
Rule Out the Simple Stuff Too
A chick that “can’t stand” is sometimes just a chick that’s weak — chilled (check your brooder temperature: 95°F week one, down 5° per week), dehydrated from shipping (dip the beak, use electrolytes), starving from pasty butt blocking the vent, or being trampled away from the feeder. And any weak chick with blood in the droppings is a coccidiosis case, not a vitamin case — that one is same-day urgent. The full weak-chick workup is in the first-week care guide and the broader sick chicken checklist.
Prevention: Cheap and Boring
Everything above traces to the same short list: fresh, quality chick starter (the whole prevention program for curled toe, in one bag), grippy brooder footing from day one (prevents spraddle leg), right temperature, and — if you hatch your own — feeding the breeder hens well, because a hen’s diet is her chicks’ vitamin reserve. Feed is the cheapest medicine in chicken keeping; this page is what happens when it’s skipped.
Real Questions from Real Keepers
My chick can’t stand up. What do I do first?
Look at the legs: toes curled under and walking on ankles = curled toe paralysis, start B-vitamin drops today. Legs splayed sideways = spraddle leg, hobble her and fix the slick floor. Just weak and sleepy = check brooder heat, water, and the vent for pasty butt. All three are day-one problems, not wait-and-see.
My chick is walking backwards. Is that even a real thing?
It is — it’s a neurological sign, most often vitamin E/selenium deficiency or a head knock. Vitamins with E and selenium immediately, fresh feed, and a quiet warm corner. Fast treatment gives the best odds.
Will the curled toes straighten out?
If you start vitamins within the first days — usually yes, often completely. The longer the deficiency ran, the more curl may remain. A little toe-taping “sandal” can help an older case hold shape while the nerves heal.
One chick has it — should I treat the others?
Yes. Same feed, same hatch, same reserves — put the vitamin supplement in everyone’s water and replace the feed bag. Treating one chick and leaving the cause is how you meet this problem twice.
Can old feed really cause this?
Really. B vitamins break down with time, heat, and damp storage — a bargain bag that sat in a hot shed can be a deficiency in a sack. Check mill dates and buy fresh in amounts you’ll actually use.
By Brad Wynne. I’ve kept backyard chickens and answered readers’ health questions on this site since 2009 — every question above came from a real keeper with a real bird.