They set upon Gloria Knowles, 71, when she entered her daughter’s home in Morden, south-west London, in October.
The dogs had shown “unpredictable and aggressive” behaviour a month before and had attacked a child and a dog.
The coroner did not give a verdict of accidental death but described it as an “accident” in a narrative verdict.
Mrs Knowles’s body was discovered by her then son-in-law who thought it was a bundle of rags in the garden.
‘Out of control’
The semi-retired shop owner sustained “extreme and shocking” injuries to her neck, arms, chest and back.
The area where she fell was soaked with blood and her clothes were ripped, the inquest at Westminster Coroner’s Court heard.
The dogs – two Bordeaux French mastiffs and two American bulldogs – were “well-kept” but they were “out of control and aggressive”, coroner Dr Fiona Wilcox said.
On the day of the attack, 30 October, Mrs Knowles had entered her daughter’s house through a gate which connects her back garden with her daughter’s garden.
At about 17:15, neighbours heard loud barking and screaming.
Mrs Knowles’s son-in-law came home from work at about 18:00 and noticed something in the garden which he thought was a bundle of clothes.
A dog-handling police officer who was first at the scene said he saw three of the dogs with Mrs Knowles’s blood on their jowls.
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