The victim, named locally as Ann Dunne, 63, was found suffering fatal injuries after the attack inside a home in St Brigid’s Crescent in Kirkdale.
Five American bulldogs, which were inside the property, were handed over to Merseyside police and were “humanely destroyed”.
Close friend Stacie Keating posted a tribute on Facebook, saying: “Can’t believe it Ann, you were the most lovely woman and a best friend to my mum.
“I’m absolutely heartbroken [but] glad my mum got to go on the holiday with you. All those lovely memories, thinking of all your family.”
Kate Burke said: “RIP gorgeous lady, still can’t believe it Ann. Had some good times with you I will never forget.”
She added: “I am all so heartbroken for you kids and family right now. Don’t want to even think how they feeling. So happy I got have old chat with you on Friday even though it was only for 10 minutes, keep looking [over] your family.”
Ms Dunne’s next of kin have been informed and a post-mortem will be carried out to establish the cause of death, the force said.
Detective Inspector Katie Coote said: “This is clearly a very distressing incident and our thoughts are with the family and friends of the lady who died.
“Our enquiries remain ongoing as we seek to establish what has happened and I would urge anyone who could assist our enquiries to get in touch.”
Anyone with information is asked to DM @MerPolCC or contact Crimestoppers on 0800 555 111 quoting reference 22000731247.
A Merseyside Police spokesman said a 31-year-old man had been arrested on suspicion of owning a dog dangerously out of control and was in custody.