Royal Canin Veterinary Diet Mobility Support Large Breed Dry Dog Food

Veterinary Diet Item

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    $84.99 FREE 1-3 dayShipping on this item

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This item requires vet authorization. Details

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Royal Canin Veterinary Diet Mobility Support JS Large Breed Dry Dog Food is a highly digestible, palatable, complete and balanced dog food formulated with New Zealand green mussel. The diet is antioxidant-enriched to help support the body’s natural immune system and has been formulated for the specific needs of large breed dogs. Royal Canin Veterinary Diet Mobility Support JS Large Breed Dry Dog Food addresses adult dogs with, or at risk of developing, degenerative joint disease (osteoarthritis). Some of those risk factors include obesity, advanced age, very active lifestyle (working dogs, hunting dogs); a history of joint injury or trauma; and genetic predisposition. This veterinarian-prescribed diet is a highly digestible, palatable, complete and balanced food for dogs. It also offers enhanced antioxidants to help maintain your pet’s healthy immune system. So give your dog a helping paw!

Key Benefits
  • Highly digestible, palatable, complete and balanced food for dogs formulated for the specific needs of large breed dogs with, or at risk of developing, degenerative joint disease (osteoarthritis)
  • Customized kibble for large jaws and teeth
  • Added EPA and DHA help support healthy joints
  • Antioxidant-enriched to help support the body’s natural immune system
  • Specific nutrient blend to help regulate intestinal transit and to help support the digestive flora

Veterinary Authorization

This product requires a veterinary authorization. Simply provide your vet’s information during checkout and we’ll follow up to confirm. If you have a copy of your authorization, you can expedite the process by taking a photo and emailing it to, or by faxing it to 1-800-619-7973.

  1. How To Order

See all items by Royal Canin Veterinary Diet

  • Item Number
  • Weight
    26.4 pounds
  • Brand
    Royal Canin
  • Breed Size
    Large Breeds, Giant Breeds
  • Food Form
    Dry Food
  • Lifestage
  • Special Diet
    Pea-Free, Veterinary Diet
Nutritional Info

Brewers Rice, Chicken Meal, Corn Gluten Meal, Corn, Brown Rice, Natural Flavors, Powdered Cellulose, Chicken Fat, Fish Oil, Dried Beet Pulp, Calcium Carbonate, Salt, Sodium Silico Aluminate, Psyllium Seed Husk, Vegetable Oil, Potassium Chloride, New Zealand Green Mussel, Fructooligosaccharides, L-Lysine, Glucosamine Hydrochloride, Choline Chloride, Taurine, Marigold Extract (Tagetes Erecta L.), Vitamins [Dl-Alpha Tocopherol Acetate (Source of Vitamin E), L-Ascorbyl-2-Polyphosphate (Source of Vitamin C), Biotin, D-Calcium Pantothenate, Pyridoxine Hydrochloride (Vitamin B6), Vitamin A Acetate, Niacin Supplement, Thiamine Mononitrate (Vitamin B1), Riboflavin Supplement (Vitamin B2), Folic Acid, Vitamin B12 Supplement, Vitamin D3 Supplement], L-Carnitine, Trace Minerals (Zinc Proteinate, Manganese Proteinate, Zinc Oxide, Ferrous Sulfate, Copper Proteinate, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), Chondroitin Sulfate, Rosemary Extract, Preserved with Natural Mixed Tocopherols and Citric Acid.

Caloric Content

3,702 kcal/kg, 307 kcal/cup

Guaranteed Analysis
Crude Protein24.5% min
Crude Fat10.5% min
Crude Fiber6.3.0% max
Moisture10.0% max
Glucosamine1,900 mg/kg min
Chondroitin SulFate100 mg/kg min
Eicosapentaenoic Acid (EPA)0.45% min
Docosahexaenoic Acid (DHA)0.2% min
Feeding Instructions
WeightDaily Feeding (Cup)
54 lbs4 1/2
58 lbs4 5/8
62 lbs4 7/8
66 lbs5 1/8
70 lbs5 3/8
74 lbs5 5/8
78 lbs5 3/4
82 lbs6
86 lbs6 1/4
90 lbs6 1/2
100 lbs7
110 lbs7 1/2
120 lbs8
130 lbs8 3/8
140 lbs8 7/8
150 lbs9 3/8
170 lbs10 1/4
190 lbs11 1/8
210 lbs12

Daily feeding recommendations may be divided into 2 - 4 meals.

Transition Instructions

We recommend at least a 7-day transition before you begin feeding the new food exclusively. Start by mixing 75% of the old diet with 25% of the new diet on Day 1 and Day 2. On Day 3 and Day 4, mix 50% of the old diet with 50% of the new diet. On Day 5 and Day 6, mix 25% of the old diet with 75% of the new diet. On the 7th day, you can feed the new food exclusively. This allows your pet’s digestive system to smoothly adapt to the new food. 


Why should I buy Veterinary Diets online?

Shopping for Veterinary Diets is easy! Chewy experts are available 24/7 to answer your questions and guide you through the process. We offer competitive prices, free shipping on orders over $49, and more savings if you sign up for an Autoship subscription.

How do I order Veterinary Diets?

  1. Search our website for the diet your vet recommends, then add it to your cart. You can purchase your Veterinary Diets with any other goodies you need!
  2. At checkout, you’ll be asked for required information. Enter your pet’s name and your vet’s name & telephone number.
  3. Place your order, and we’ll take care of the rest!

How will you contact my vet?

Our Veterinary Diets team will personally contact your vet for approval. If your clinic needs more information from you or recommends a different diet, we’ll let you know immediately.

Does it help if I send you my veterinarian’s authorization?

Yes! If you have a paper copy of your vet’s authorization, email a picture to, start a chat, or fax it to 1-800-619-7973.

Can I use a veterinarian’s authorization if it was written by a veterinarian out of state?

Of course! We can accept valid authorizations from anywhere in the United States and Canada—that includes US territories, like Puerto Rico.

Why do I need a veterinarian’s authorization?

Veterinary Diets are formulated with the precise ingredients and nutrients needed to address specific medical issues. If you don’t have a paper authorization, no sweat—once you provide your vet’s information, our team will take over.

Can someone else (such as a caretaker or family member) place an order for my pet?

Yes, but we’ll need them to provide us with the full name of the pet’s owner’s name via phone, email or chat after the order is placed, so the clinic can locate your pet’s records when we contact them.

How can I help expedite my order?

Just follow these simple steps:

  1. Create your pet’s profile on
  2. If you have an Autoship scheduled, but you’re running low on your Veterinary Diets, contact us ahead of time to let us know if you have a new clinic or if any authorization information has changed.
  3. If you have an authorization handy, send it to us before you order—by sending an email to, starting a chat with one of our experts, or faxing us at 1-800-619-7973.

Do I need to set up a pet profile?

We recommend it, but it’s not required. You can create your pet’s profile by logging in at, hovering over your account, and choosing “pet profile.”

Do authorizations expire?

Yes. Your vet will tell us when your authorization will expire and how many times we can send before they’d like you to check back in with them.

Can I set up automatic refills?

Yep! Sign up for Autoship and we’ll automatically ship your Veterinary Diets for as long as your authorization allows. If you run out of refills, or your authorization expires, we’ll automatically contact your vet for a new authorization. If we hit any bumps in the road, we’ll let you know right away.

What if I have more questions? How can I reach the Veterinary Diets team at Chewy?

Email us at, start a chat on, or call us anytime at 1-800-672-4399. We’re here for you 24/7.

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