A police raid on an illegal kennel in Parla, near Spain's capital Madrid, found more than 100 dogs suffering from neglect.
Agents from Seprona, the nature protection wing of the Guardia Civil, accompanied by veterinary personnel, found dogs "suffering pain and distress" and conditions such as wet dermatitis, serious periodontal diseases, otitis and the presence of internal and external parasites.
Reports detailed that five puppies had died due to the conditions and the lack of veterinary care.
After checking papers, the clandestine centre was found not to have the correct licences.
Seprona officers arrested the owner of the kennels for alleged animal abuse and neglect crimes.