Southern Police are warning residents to keep their pets safe after the theft of an American Bulldog and reports of suspicious behaviour concerning dogs.

The white American Bulldog was stolen from a Wyndham property a week ago. It has brown patches and floppy ears.

Two men were also seen looking into properties in the Strathern area this afternoon, paying particular attention to dogs in the area.

"We're aware that some breeds of dogs may be targets for theft and we don't want to see any residents become a victim to losing their treasured pet," acting senior sergeant Jared Kirk said.

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"Owners must ensure their pets are secured sufficiently during the day and microchipped."

Kirk encouraged residents to report any suspicious behaviour and to keep an eye out for their neighbours' properties.

"Get to know your neighbours and talk about keeping each others' properties safe and secure," says Mr Kirk.

"We have no information to suggest any ongoing illegal activity is occurring in relation to dogs in the area but ask residents to report any concerning behaviour.

"We need everyone's help to ensure we maintain safe communities."

Concerning behaviour can be reported to Invercargill Police on 03 211 0400