Armadale Police were investigating a recent series of Kelmscott veterinary burglaries during which medication, vaccines and appliances were stolen.
The burglaries occurred on May 29 and June 6 and police said adrenalin, anti-bacterial medication and a pet identification microchip scanner were taken.
Dog and cat anaesthetic and anti-inflammatories were also stolen.
Police warned the medication was not for human use and could be harmful if consumed.
Detectives asked for anyone who might have seen a person or persons acting suspiciously along Railway Avenue and Albany Highway in the early hours of either date to contact them.
Call Crime Stoppers on 1800 333 000 or make a report online at crimestopperswa.com.au.