Need Advice on Fixing an Architrave Please! (Desperate Here!)

Hey Everyone,

I moved to Sydney from Toronto, Canada with a small dog that was stuck in quarantine for a month. While I had to move furniture and confine him in my bedroom at the house I'm staying at, he pawed and tore at the architrave on the bottom-right side of a door. The whole experience was a nightmare. My landlady wants this fixed asap, and my dog landed up at an emergency clinic from consuming wood. The whole thing's SNAFU'd, but right now I just need to get this fixed.

I need to:

(1) Figure out what fill to use on this wood (TimberMate? Saw it on this forum) so I can then sand, prime, and paint it back to appear at its original state (this is what I've been advised to do when given quotes on replacing the wood and getting the architrave custom cut).
(2) I assume getting fill requires I know the type of wood. A handyman dropped by and said it looks like cedar, not timber, which raises the question of whether or not I could/should use Timbermate on cedar, if this in fact is not timber. How can I tell since I'm not a carpenter?
(3) If anyone here can link me to a guide on repairing/filling/sanding/priming/painting a torn up bit of architrave or something similar I'd appreciate it as I don't know what I'm doing but from an amateur's perspective it sounds easy enough - just time-consuming.

This house is very old. The architrave is painted white. Architrave width is about 12 cm. Damage goes up about 0.5m. I have attached pictures. If you can help identify the wood (if that's necessary) or point me in the right direction of what I need to buy at Bunnings and how I should go about patching this up, I would be extremely grateful. To experts like you guys on this forum this job should be a piece of cake. I just need the low-down on how an amateur like myself needs to go about it.

Thanks in Advance,

-Michael

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