Rx Vitamins Rx D3 Liquid Immune Supplement for Cats & Dogs, 2-oz bottle

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Help ensure your furry family member is getting all the vitamins she needs with Rx Vitamins Rx D3 Dog & Cat Supplement. This liquid solution is specially crafted by a veterinarian and contains vitamin D3 in the form of cholecalciferol. It helps your paw-ter absorb phosphorus and calcium and helps support healthy immune function and health! This supplement comes in a convenient liquid form for easy administration and is paw-fectly suitable for canine companions and feline friends alike, so all your pets can get a boost of vitamin D3!

Key Benefits
  • Helps provide your pet with a boost of vitamin D3 from cholecalciferol.
  • Supports your sidekick’s immune system and helps her body absorb phosphorus and calcium more easily.
  • Suitable for both cats and dogs.
  • Expertly crafted by a veterinarian.
  • Carries the National Animal Supplement Council Seal (NASC).

Safe use in pregnant animals or animals intended for breeding has not been proven. If an animal's condition worsens or does not improve, stop product administration and consult your veterinarian. An examination from a veterinarian is recommended prior to using this product.

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  • Item Number
  • NASC Certified
  • Lifestage
  • Breed Size
    All Breeds, Extra Small & Toy Breeds, Small Breeds, Medium Breeds, Large Breeds, Giant Breeds
  • Food Form
  • Product Form
Nutritional Info

Vitamin D3 3000 IU

Feeding Instructions

1 drop daily, or as recommended by your health care professional.


Why should I include vitamins & supplements in my pet’s diet?

Most commercial pet foods include baseline vitamins and nutrients, but some may not have the adequate amount to suit your pet’s exact health needs. Like in humans, vitamins and supplements can help support your pet’s long-term health, regulating everything from digestion to muscle growth. Consult your veterinarian to determine the best vitamins and supplements for your furry friend.

How often should I give this supplement to my pet?

It is recommended to give the suggested dosage based off your pet’s weight. Please refer to the Feeding Instructions tab and consult with your veterinarian for more information.

Is this supplement safe to use with the medication my pet is currently taking?

If your pet has a medical condition and is taking other medication, we recommend consulting with your veterinarian to ensure that this supplement is safe to use.

My pet is allergic to certain ingredients, will this product be safe to use?

For a complete list of ingredients, click on the 'Nutritional Info' tab, next to the 'Description' tab, just under the product photos. If you are unsure about the safety of this product for your pet, we recommend consulting with your veterinarian.

Does this product come in other product forms?

For a complete assortment of products by the manufacturer of this supplement, click on the link next to the item name at the top of the page. You can also find an assortment of supplements across all product forms on our page.

Rating: 4.4 of 5 stars 5 Reviews 5 Reviews 4.4 out of 5 Stars

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80% Recommend

80% of reviewersrecommend this product

Rating: 4.4 of 5 stars 4.4 / 5

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5 Reviews

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  • 5 out of 5 stars

    Just like I get from my vet

    By PugMom on Feb 16, 2021

    I was happy to get on autodelivery of this medication since my dog needs to be on this going forward. This is exactly the same as I get from the vet. Super convenient. Yes, the dropper top is not well made and as you use the bottle the dropper cover fails. The mfg should do something about this issue for sure.

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  • 5 out of 5 stars

    Two 15 year old cats ! 3 Drops in their wet food every morning.

    By TaterTot on Jul 1, 2020

    My “Cat Only” vet who has been practicing for 45 years suggest this for all cats. Vitamin D levels are important ! The tasteless drops are easy to give to them with the eye dropper in the bottle. And of course CHEWY’S PRICE is the best as always.

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  • 5 out of 5 stars

    Great packaging

    By Lulu on Jun 2, 2020

    This is the second time I’ve purchased this. I’m happy to say the dropper has been improved. Getting the correct amount in the dropper is easy and without fuss. Much better than before. AND I received it sooner than estimated!

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  • 2 out of 5 stars

    Vitamin D3 very low dose

    By VitaminD3 on Apr 27, 2020

    Purchased your Vitamin D3 supplement for my dog who is very Vit D3 deficient (determined by test). He requires 4000 IUs of Vit D3 per day. Your version of Vit D3 contains 100 IUs per drop. So you can do the Math! The ad for Vit D3 did not specify how low of a dose it is. In comparison, stsndard Vitamin D3 purchased at a store contains 1000 IU per drop. Disappointing!

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  • 5 out of 5 stars

    Vet Recommended

    By Lorie on Jun 12, 2020

    This Vitamin D brand and strength came recommend by my vet when my dog’s bloodwork came back with a Vitamin D deficiency. She gets 6 drops in her food daily.

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