Following our detailed article on cyanobacteria and the dangers they pose to dogs, here's the essential information as a practical checklist — to check before every swim in open water during the warm season.
Before heading out: the warning signs
- Stagnant water, especially in summer and late afternoon
- Unusual coloring: bright green, blue-green, sometimes reddish
- Thick foam or a "spilled paint" appearance on the surface
- Earthy or foul smell
- Visible buildup at the edges, in shallow areas
A single one of these signs is enough to rule out the spot.
Good habits on walks
- Check locally for algal bloom warnings before setting out
- Prefer flowing, well-oxygenated water over stagnant ponds
- Always bring clean water for the dog to drink
- Never let the dog drink from water of dubious appearance
- Be extra vigilant in late summer
If the dog did swim in suspect water
1. Rinse thoroughly with clean water right away, before it can lick itself
2. Prevent it from licking its coat during the drive
3. Rush to the vet without waiting for symptoms
4. Never induce vomiting without veterinary advice
5. Report the exact swimming location to the vet
The quick checklist
Clear, flowing water > stagnant, colored water. Water brought from home > water from the pond. Immediate rinsing > "we'll see." Vet right away > waiting for symptoms.
To understand why this risk is so serious and how it affects the body, our full cyanobacteria article covers the mechanisms and symptoms to watch for.
Also available in English: harness or collar: which to choose depending on use, ticks and parasites: protecting the active dog all year round and paw pad care: protecting the active dog's feet. More translations are added over time.