Cornwall Council introduced the ban on dogs as one of several Public Space Protection Orders (PSPOs), Cornwall Live reports.
The PSPOs will be in place on 30 beaches, with restrictions that came into force on 1st July and are set to last until 31st August.
When the PSPOs are in force, dogs are unable to go to the beach between 10am and 6pm.
It is not unusual for dogs to be banned from Cornwall's beaches and the PSPOs come into force every summer.
Dog owners who breach the rules could face a penalty ranging from a £100 fixed penalty notice to a £1,000 fine.
Some beaches in Cornwall have restrictions which began on 15th May and will continue until 30th September. These beaches have a Blue Flag and Seaside Award and are instructed to have restrictions which last a longer period of months. The beaches, which are listed below, also ban dogs between 10am to 6pm.
In other news, vets are warning against the dangers of grass seeds on dogs. Grass seeds can be very harmful to pooches and can be seen attached to the top of long grass stems. They are a particular problem in the summer months.
Grass seeds also pretty sharp and pointy, so if your dog walks through long grass, the seeds can easily brush off and onto their fur, or worse, becoming lodged in the eyes, ears or nose.
Caroline Reay, Head of Veterinary Services at national pet charity Blue Cross said: "Dog owners should check their dogs, particularly around the feet and ears, after walking through areas with long grass."
You can read more here.
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