Our community members are treated to special offers, promotions and adverts from us and our partners. You can check out at any time. More info A walker has issued a warning to dog owners after spotting a potentially deadly snake along Cornwall's coastal path. The adder, a venomous snake, was seen slithering around in St Ives. While not a serious threat to humans, adder bites can prove fatal for dogs in a matter of hours. Susan Roux has had two of her dogs bitten in the past so she wants to remind people to be vigilant. The People's Dispensary for Sick Animals (PDSA) says: "There are three types of snake in the UK: grass snakes, smooth snakes and adders. The adder is the only venomous species, grass snakes and smooth snakes aren't venomous and don't tend to bite. Adders tend to keep themselves to themselves and don't bite unless they are scared, unfortunately, dogs tend to approach them without fear, startle them and get bitten." The short clip, captured by fellow walker Rob, of Fishing For Bass, shows the snake basking in the sunshine near long grass at Man's Head Way on Monday, April 28. Join CornwallLive on WhatsApp and be first to hear what's happening near you Ms Roux said: "People, be aware with dogs or even cats roaming long grasses, they're out with the warm weather up until past 7pm. Be very vigilant. I had two dogs bitten. Total of £7,000. How one survived I don't know because he had an allergic reaction to the anti-venom too." She said one of her pets spent three weeks in an emergency vet in Truro as a result. She said: "They love the heathland on coastal walks to hide under rocks to bask on." If your dog is bitten you should take them to the vet as a matter of urgency. Adder bites can occur from February to October but are most common in the summer months. With treatment, most dogs recover from adder bites, but some bites are very serious and cause severe illness and even death.