The Letting Centre

If a carpet has been damaged by a tenant - or in this case a tenant's pet which had been kept in the house without permission - can the landlord claim the entire replacement cost from the tenant?  If not, and the landlord has to pay a percentage of the replacement cost but does not wish to incur that expense at this time, can he retain the tenant's proportion of the replacement cost until he is in a financial position to proceed with replacement?