Common Causes of Upset Stomachs in Puppies Explained

Puppies are wonderfully delicate and still-building their immune systems, making them more susceptible to tummy upsets than adult dogs. Most cases are minor and resolve quickly, but knowing the typical causes can help you care for your growing puppy responsibly.

If you have a puppy or plan to find one, understanding why they may have an upset stomach is a vital part of responsible pet ownership. This guide explains the common reasons puppies develop digestive issues and how you can prevent or manage them carefully.

1. Transmissible Illnesses and Vaccinations

Your puppy’s immune system is immature, so early vaccination is essential for protection against serious infectious diseases such as parvovirus. Until fully vaccinated, it’s safest to restrict your puppy to your home and garden, avoiding contact with unvaccinated dogs to reduce risk of contracting harmful viruses or bacteria.

The parvovirus infection, in particular, can cause severe and potentially fatal gastrointestinal symptoms, making vaccinations critical for your puppy’s health.

2. Sudden Changes in Diet

Puppies often only know one type of food when they come home. Switching their diet abruptly can cause digestive upset. Gradually change their food over a two-week period, mixing increasing amounts of the new food with the old to help their stomach adjust smoothly.

Even if your puppy appears to enjoy the new food, rushing the transition risks diarrhoea or vomiting, so patience is key.

3. Ingesting Harmful Foods

Puppies are curious and eager to sample all kinds of foods, but many common foods like chocolate, grapes, and onions can be toxic. Keeping dangerous foods out of reach is a vital safety measure, especially for breeds like the Labrador Retriever puppies known for their eager appetites.

Teaching your puppy boundaries around food and not giving in to begging helps prevent accidental ingestion of harmful substances.

4. Swallowing Foreign Objects

Chewing is a normal part of teething for puppies, but it can lead to swallowing unsafe objects such as small toys, strings, or household items. Providing plenty of safe, sturdy teething toys and supervising playtime reduces the risk of blockages or internal injury.

5. Excessive Treats During Training

Training your puppy with treats is rewarding, but too many rich or salty treats can cause upset stomachs. Opt for natural, low-salt, and low-sugar treats and carefully ration daily amounts to maintain digestive health.

6. Stress and Environmental Changes

Moving to a new home, new routines, and learning social skills can cause stress for puppies, which sometimes manifests as digestive upset. Establishing a calm, consistent daily routine with gentle encouragement helps puppies adapt positively, reducing stress-related stomach issues.

7. Parasites and Infections

Parasites such as roundworms, hookworms, and giardia are common in puppies and can cause diarrhoea and sickness. Regular vet checks and appropriate deworming treatments are essential in keeping your puppy parasite-free.

Additionally, bacterial or viral infections can also upset your puppy's digestive system. Observing your puppy for persistent symptoms and consulting your vet when concerned ensures prompt treatment.

Looking After Your Puppy’s Tummy

To keep your puppy’s digestive system healthy, maintain vaccinations, introduce food changes slowly, avoid harmful human foods, provide safe chew toys, moderate treats, reduce stress, and stay vigilant for signs of parasites or illness.

If your puppy displays severe or persistent vomiting, diarrhoea, lethargy, or blood in vomit or stool, seek emergency veterinary advice immediately.

How to Choose a Healthy Puppy Responsibly

When looking to add a furry friend to your family, it’s wise to find a puppy for sale from a reputable breeder who prioritises health and welfare. This ensures your puppy comes with proper vaccinations and health history, reducing the chance of illness including stomach upsets.

Being an informed, compassionate pet owner means giving your puppy the best start for a happy, healthy life.

When Can Puppies Safely Socialise?

Quick Answer: Puppies can start socialising after their second set of vaccinations, usually around 12-16 weeks of age, to avoid exposure to infectious diseases.

Until fully vaccinated, it’s best to limit your puppy’s contact to safe environments. Early but safe socialisation supports confident behaviour development, so talk to your vet about the best timing and places to introduce your puppy to the world.