An 18-year-old man was arrested on suspicion of attempted murder.
Three more people have been arrested after a woman was attacked in Copt Oak on Wednesday evening (8 December).
An 18-year-old man was arrested on suspicion of attempted murder and an 18-year-old man and 17-year-old woman were arrested on suspicion of assisting an offender.
The victim, who is in hospital in a serious condition, was in Copt Oak looking for a stolen dog when she was attacked with a bladed weapon.
The black and ginger lurcher called Duke has not been located.
Two other men aged 52 and 30, who were arrested on Wednesday night, have been released on bail.
Detective Sergeant Jenny Tattersall, from the Complex Investigation Team (CIT), said: “While we have arrested three more people, our investigation is still very much continuing.
“I would like to speak to anyone who has information about the incident but has not yet come forward. Any details you’re able to provide could be of great help.”
You can pass on information by visiting https://www.leics.police.uk/ro/report/ocr/af/how-to-report-a-crime/ and quoting reference 21*714611.

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