Two dogs were found dead after a burglary on Graddfa Industrial Estate in Llanbradach.
The two 14-month-old German Shepherds were locked in the back of a scrapped car and apparently died of heat exhaustion.
Car parts, including catalytic converters and alloy wheels, were stolen from the yard by three men on May 11.
Gwent police are now appealing for information to identify a man (pictured) in connection with the incident.
Anyone with any information about the incident or anyone who recognises the man pictured is asked to ring 101 or Crimestopppers anonymously on 0800 555 111 quoting log 56 12/05/14