One of Princess Anne's dogs bit two children last year

The English bull terrier attacked one of the Queen's beloved pets on Monday at Sandringham, breaking its back legs so badly it had to be put down.

The same dog, called Dotty, landed the princess in court after it bit two children in Windsor Great Park in 2002.

Now the RSPCA, of which the Queen is patron, says it is "obviously a rogue dog" and should be put down.

A spokesman for the charity told the Sunday Telegraph: "Our philosophy is that we allow a dog one bite.

Sadly, this is an unpredictable dog that has bitten once and now has killed RSPCA spokesman

"This English bull terrier has already attacked two children and is obviously a rogue dog.

"Sadly, this is an unpredictable dog that has bitten once and now has killed.

"Muzzling the dog would not give it a good quality of life and the safest option is to put it down."

Criminal record

Princess Anne appeared before magistrates last November and pleaded guilty to the charge under the Dangerous Dogs Act that Dotty had attacked the two children.

Then, Dotty left a 12-year-old boy with a bite on the collarbone and two bites to the left leg.

A seven-year-old boy was left with scratch marks on a leg, his back and an arm.

Anne was fined �500 and ordered to pay �500 compensation to the children and �148 in court costs.

She was told to organise training for Dotty and to keep her on a lead in public places.

Children fears

She was also warned by the judge that if there were any further attacks, the dog would have to be destroyed.

The Queen was said to be devastated at the death of her corgi Pharos.

The RSPCA's statement is one of a growing number of calls for the princess to consider Dottie's future.

Michele Elliot, of children's charity Kidscape, told the Sunday Telegraph, it was "high time" the dog was put down.

"Next time, it could be a child that is killed."