I'm a landlord, a tenant and a dog owner and I feel your pain.
My biggest dog is 20kg and doesn;t scratch the floors.
I think the scratches are probably fairly superficial and maybe with a bit of a polish with beeswx they might be alright.
In the current house I'm renting, my neighbour called in with her husky, who is well known to my own dog. The husky was moulting alot so I put the two dogs in the utility room for the duration of the visit.
Bad idea, the husky clawed big chunks out of the solid wood door. :mad:
So you have my sympathy.