Tests are being carried out in the New Forest after eight dogs died after being taken for walks at a popular beauty spot.
Vets say the animals got a cut on their paw and think a mystery toxin in the ground could have infected the wound.
The council says it's looking into the claims and people should stay away from Latchmore Brook near Fordingbridge if they're worried.
Martin Dowse speaks to Roger Stobbs, of Forest Veterinary Clinic, and dog owner Pauline Chalk.
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A damp and cold night ahead. Valentine's Day will start cloudy but become brighter in the afternoon. Risk of showers along the Kent coast.
Cold and damp tonight with outbreaks of rain. A cold and dull start to Valentine's Day but becoming drier and brighter by the afternoon.
Rain turning more patchy this afternoon but more persistent along the coast. Feeling cold in the brisk north-easterly wind.