Will my last minute booking, where my dog has not been 'interviewed' by management at MLD be accepted even if I have paid my deposit, if my dog is found not suitable? I.e. by being too large for his room, too aggressive etc., or found to be a chewer?

No. Admission is reserved, and your deposit will be lost for staff availability and administration costs. Directions and contact details for a kennel nearby will be made available.