Folate (vitamin B9) is essential for cell division, DNA synthesis, and amino acid metabolism. Every time your dog's body creates new cells — whether replacing skin cells, producing red blood cells, or growing a puppy — folate is required. It works hand-in-hand with vitamin B12 in red blood cell production, and deficiency in either vitamin can cause a particular type of anemia characterized by large, immature red blood cells. Folate is especially critical during pregnancy for proper fetal development, particularly neural tube formation in the earliest stages. Dogs on medications like methotrexate or certain antibiotics may have increased folate needs.
A small handful of cooked spinach (about 50g) provides roughly 75–100mcg of folate — a medium dog needs approximately 68–200mcg of folate per day. Spinach, lentils, broccoli, peas, and eggs are excellent sources. Folate is heat-sensitive, so lightly cooked vegetables retain more than heavily boiled ones. Pregnant dogs should ensure adequate folate intake for healthy fetal development.
0.0% of daily nutrient intake
Vitamin B9 (Folate) makes up 0.0% of your dog's total daily nutritional requirements by weight. That's a tiny amount — but it matters.
Megaloblastic anemia (large, immature red blood cells that cannot carry oxygen efficiently), weight loss, poor appetite, and reduced immune function. In pregnant dogs, folate deficiency can contribute to birth defects. Signs may be subtle at first — lethargy and mild anemia — before progressing to more visible symptoms.
Folate is water-soluble and excess is excreted in urine. Toxicity from dietary or supplemental sources is not a practical concern for dogs. Very high doses are well tolerated.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | medium 10-25kg | 68 | 200 | mcg | NRC recommended allowance. Folate works with B12 for red blood cell production and DNA synthesis. |
| Pregnant / Nursing | — | 100 | 300 | mcg | Pregnant dogs need higher folate for fetal cell division and neural tube development. |
| Senior | medium 10-25kg | 68 | 200 | mcg | Senior dogs maintain similar folate needs. Adequate folate supports ongoing cell renewal and immune function. |
Source: NRC 2006
Folate and B12 work together in the methylation cycle, which is essential for DNA synthesis and red blood cell maturation. Deficiency in either vitamin causes megaloblastic anemia with large, immature red blood cells.
What this means: When evaluating anemia or poor blood work, check both folate and B12 levels. Supplementing one without the other may mask the deficiency of the missing vitamin. Eggs and salmon provide both nutrients naturally, supporting the methylation cycle from both sides.
