Sentencing of Clive Sharp, who has admitted murdering Flintshire vet Catherine Gowing, has been adjourned until next month. He has been remanded in custody until then.
The judge, Mr Justice Griffith-Williams, said: 'There is only one sentence I can pass on you for this offence, as you will know."I have to work out what the minimum term you will serve is before the Parole Board consider you for release - if you are ever to be released.'
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The fire started on the first floor and roof space of the property which spread to four neighbouring homes.
The dog, named Clyde, left his partner in crime Bonnie behind and made his getaway through an open garden gate.
The court heard that several searches for far-right leaders were found on devices seized from Darren Osborne's home.