A 4x4 and four bottles of a substance used to euthanise animals were stolen during a burglary in Enniskerry, Co Wicklow.
An investigation is under way into the incident, which happened at a premises in the Co Wicklow village between 6.30pm and 7.40pm on Friday.
The black Land Rover Discovery, with a 10-D registration, contained 400ml of 'Dolethal' pentobarbital.
The toxic substance is not intended for human consumption and is used by veterinarians to euthanise small animals and cattle.
The product, which is a red colour, was in four 100ml clear glass bottles with the 'Dolethal' brand name.
Gardaí and the Health Products Regulatory Authority are very anxious that this item is recovered.
They appealed for anyone who may have any information to contact Bray Garda Station on 01-6665800, the Garda Confidential line on 1800-666-111 or any garda station.