Nicole Cross was walking on Sand Bay beach, near The Commodore Hotel, when she watched a Staffordshire bull terrier take four-year-old Sapphy in its jaws and shake her until she was limp.
Within 30 minutes of the attack on Saturday afternoon the King Charles spaniel, pictured, had died.
Nicole, who was walking with partner Pete at the time of the incident, says she is scared to go back to the beach to walk her other dogs following the attack.
She says it was about 3pm when the Staffordshire bull terrier jumped on Sapphy, sinking its teeth into her and causing multiple puncture wounds.
When it backed off, Nicole, aged 41, and Pete, rushed their wounded pet to a vets, but she was bleeding heavily and suffering from shock.
Nicole, who lives with Pete part of the time in Kewstoke, said: “Sapphy had been walking behind my heel as normal, when the other dog tore past Pete’s leg and jumped on her.
“It sunk its teeth into the back of her and we couldn’t get it off.
“The owners came over and put it on a lead and asked if Sapphy was okay, but I said ‘does she look okay?’ and rushed her to the vets.
“I’d tell other dog owners to be careful when going down there – I’m fearful of going again.”
Police say they are looking into the incident. Anyone with information is asked to call 101.
(Weston & Somerset Mercury - Nov 19, 2012)
