If your levels are low, discuss appropriate Vitamin D supplementation with your physician. (holtorfmed.com)
Do consider supplementing your dogs nutrition with appropriate vitamins and minerals (consult you vet beforehand). (happyjackrussell.com)
This is why parents considering the use of soy formula should speak with a Pediatric Registered Dietitian to make sure the appropriate vitamins and minerals are provided in the formula or supplemented. (yummymummyclub.ca)