Signs of Calcium Deficiency in Dogs and How to Supplement
📝 Summary
Calcium shortage shows differently by life stage: puppies develop rickets with bent legs and pica, adults get tetany and fragile bones, and nursing mothers can suddenly collapse with eclampsia-like spasms. Correction is calcium and vitamin D by injection or mouth, plus sunlight and a proper calcium-to-phosphorus diet.
1 Signs in Puppies
Puppies with rickets prefer to lie down and show pica — chewing walls, stones, sand, and other odd objects; late tooth eruption and poor appetite; arched back with a stiff, lameness-prone gait. The clearest sign is bone deformity: swollen ends, bowed limb bones in a ‘knife’ or ‘X’ posture, and frequent shifting of weight while standing. The skull and nasal bones swell, the hard palate protrudes, ribs flatten, and the chest narrows.
2 Signs in Adults and Nursing Mothers
Adult dogs show tetany, bleeding, loss of breeding ability, and spontaneous fractures. A nursing mother suddenly becomes restless, walks stiffly, and goes rigid in the hindquarters; her head, neck, chest, and abdomen muscles go into tonic spasm, she collapses with opisthotonos, breathes fast, sweats, rolls her eyes up, locks her jaw (sometimes chomping), pushes her tongue out, and foams purple at the mouth. She trembles all over with a weak heartbeat and stiff limbs, much like poisoning.
3 Treatment
10% calcium gluconate 0.5–1.5 ml/kg (never over 10 ml per dose), slow IV twice daily for 5–7 days. Vitamin-D calcium injection 0.05–0.1 mg/kg once daily for 5–7 days, IM or SC. Vitamin D injection 1,500–3,000 IU/kg once daily for 7 days, orally. Bone meal, shell powder, or Nanjing stone powder 1.5–3 g/day mixed into feed. Precipitated calcium carbonate 0.5–4 g or calcium lactate 0.5–2 g per dose orally. For fever, add penicillin 400,000–800,000 IU IM; for loose stool, gentamicin 40,000–80,000 IU IM twice daily for 2–3 days.
4 Care and Prevention
Give the dog plenty of sunlight and ensure the diet carries 50–100 IU of vitamin D, with a calcium-to-phosphorus ratio of about 1:0.9–1.1.
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