Pondweed and dogs

13.8.24

Pondweed and dogs. Not necessarily a good mix. Aquatic weed grows in freshwater like ponds, lakes, and slow-moving rivers and can pose a danger to dogs, so all dog owners should always be vigilant around ponds and lakes where weeds remain untreated and unmanaged. The best advice we can give is to check it out for yourself, pay attention to warning signs, and always keep your dog on the lead. While generally benign, blankets of duckweed, for example, can pose a potentially serious hazard to pets nonetheless

Which pondweed is a danger to dogs?

Pond weed is generally non-toxic to dogs but can be confused with blue-green algae or cyanobacteria, which is toxic to dogs and can be fatal if ingested. Blue-green algae is green, blue-green, or green-brown in appearance. It often takes the form of foam, scum, or clumps, and can exist alongside pondweed. While not technically a weed, it tends to grow in ponds and resemble pond weeds, making it difficult to identify.

Dogs risk ingesting toxins swim in or drink water contaminated with blue-green algae. Symptoms ranging from vomiting, diarrhoea, and lethargy may follow, or perhaps even more severe conditions like seizures, and liver failure. Dogs tend to gulp water while swimming, lick their fur afterwards, or drink from ponds.

Can dogs become entangled in pond weeds?

Dense pondweed mats on the water surface can confuse dogs who might mistakenly think it’s a continuation of the grass. This pondweed can entangle dogs, especially wee breeds or inexperienced swimmers, and this can prematurely exhaust or panic dogs.

Pondweed might also cause obstructions if ingested, should your dog swallow parts of the plant while drinking or playing. This might cause blockages in the throat or digestive tract, which as well as being a choking risk could also cause gastrointestinal issues that immediately require a vet.

Pondweed, bacteria & disease

Pondweed can also be breeding grounds for bacteria and parasites, so your dog may be exposed to harmful pathogens. Take the bacterium Leptospira, for example. It thrives in stagnant water and can cause leptospirosis—a serious illness that affects the kidneys and liver. Dogs can contract this disease by swimming in or drinking contaminated water, and pondweed might well harbour such bacteria.

Pondweed can also host parasites, microscopic organisms that can infect dogs that ingest the contaminated water or come into contact with wet fur. Symptoms might include diarrhoea, vomiting, and dehydration, which can be more pronounced in puppies, older dogs, or dogs with compromised immune systems.

Dog safety around water

Here are some tips to keep your dog safe around water

Warning signs

Look out for any warning signs from an environmental agency or local authority.

Stagnant water is a no-no

Stagnant ponds are more likely to harbour toxic algae, bacteria, and parasites. Keep your dog away, especially in hot weather.

Keep a watchful eye on your pooch

Always keep your dog in your field of vision when swimming in natural water bodies so you can ensure they're not struggling or panting too hard. Keep an eye out for thick mats of pondweed and keep your dog away from them.

Clean canine

A head-to-toe rinse with clean water to remove any potentially harmful substances is a great idea post-swim. Paws, faces, and belly are the areas most likely to come into contact with algae.

Carry fresh water

If you carry fresh water and give it to your dog at regular intervals, it might reduce their temptation to drink from ponds.

Be symptom smart

Familiarise yourself with the signs of toxicity and illness related to pond weed exposure. Seek veterinary care immediately should your dog show any of these symptoms after being near or in a pond: vomiting, diarrhoea, lethargy, or difficulty breathing.

Sources:

Gardenersworld.com

bva.co.uk