Feeding Your Rescue Dog: Safe Diet Transitions

Bringing a new dog into your home involves many changes, including transitioning them to a food that is locally available, affordable, high-quality and appropriate for their needs. Sudden changes to a dogs diet can lead to gastrointestinal upset such as vomiting and diarrhea, so transitions should be done gradually to minimize these issues and reduce stress.

Ideally, when you adopt a new dog, they will come with a small amount of the food they have been eating. This is not always possible, particularly for dogs arriving from other countries, because it is not always legal or easy to import dog food. If the rescue cannot provide the original food, it is helpful to know what type of food the dog was previously eating.

This guide covers how and when to change your dogs food, how to choose an appropriate diet, and what to monitor during the transition.

The 4-Step Plan for Changing Your Dog's Diet

Step 1: The First Few Days - Keep Things Consistent

Day 1-3: If possible, feed the same food your dog was eating before adoption. Moving into a new home is a stressful time for dogs, and maintaining some consistency can help them settle in.

• If you have a sufficient supply of the old food, feed it for 1-3 days before starting a transition.

• If you only have a small amount, begin transitioning on day 1 or 2

• If you have none, choose a food similar to what they were previously eating.

  
  

Helpful tips:

• If your dog was previously eating canned/wet food then continue feeding wet food rather than switching to kibble right away. If they are used to kibble, then feed them kibble.

• Ideally choose a food with the same primary protein (ex. chicken, beef, salmon) as their old food. This can help minimize digestive upset.

• You may need to try a couple of options to find what your dog prefers.

• Avoid adding treats or human food to meals because this can quickly create picky eaters who will refuse to eat unless you add a special treat. Picky-eaters create a lot of stress and difficulty for owners, and it can become and issue if the pet develops a medical condition which means they cant special treats anymore. it is okay to give some treats to help your dog bond with you, but don't add treats to their meals.

Step 2: Choosing a New Diet

Whenever possible, consult your veterinarian for guidance - especially if your dog has underlying health conditions.

General recommendations:

• Avoid grain-free diets, particularly those high in legumes (ex. peas, lentils), which have been associated with serious heart conditions called dilated cardiomyopathy (DCM) in dogs.

• If your dog was doing well on their previous diet (normal bowel movements, healthy weight, no itchiness), then choose a new food with similar ingredients.

• Use feeding guidelines on the bag as a starting point, but adjust based on your dogs body condition, activity level, and life stage (puppy, adult, or senior). Some dogs need significantly more or less food than the amount suggested on the bag.

Keep in mind:

• Puppies, highly active dogs, and pregnant dogs require more calories

• Dogs may gain weight more easily after being spayed or neutered.

• Treats (including human food) should make up no more than 10% of the diet to ensure nutritional balance.

  
  

Step 3: Start the Transition

Diet changes should be gradual, ideally over 7-10 days:

• Day 1: 10% new food/90% old food

• Day 2: 20% new food/80% old food

• Day 3: 30% new food/70% old food

• Day 4: 40% new food/60% old food

• Day 5 : 60% new food/40 % old food

• Day 6: 80% new food/20% old food

• Day 7: 100 % new food

Rapid changes are a common cause of diarrhea.

Step 4: Monitor Your Dog

Monitor your dog during the transition and for at least 2 months after switching diets.

Early signs to watch for:

• Decreased appetite

• Vomiting

• Diarrhea

  
  

Ongoing monitoring:

• Poop quality (soft stool, constipation, straining)

• Weight gain or loss

• Signs of itchiness (paw licking, scratching, ear irritation, head shaking)

Mild diarrhea is relatively common during a diet transition and often resolves within a few days. If the diarrhea is mild and your dog has normal energy and appetite, it can be monitored and may benefit from dog probiotics (available from pet stores, vet clinics and online without a prescription).

Seek veterinary care urgently if:

• Diarrhea is severe or persists for more than a few days

• There is vomiting, lethargy, or reduced appetite

• Blood is present in the stool

Issues such as vomiting, sever diarrhea, low energy, or low appetite should be urgently assessed by a veterinarian. If you are unsure if symptoms are serious, then consult your veterinarian right away.

Final Thoughts from Dr. Alyssa Kreager, BVM&S.

There is a lot to consider when bringing a new dog into your home, and nutrition plays a key role in their overall health and well-being. A thoughtful, gradual diet transition can help set your new dog up for success and strengthen the bond you share.