Dog biscuits laced with nails and needles have been planted on streets in a “calculated and abominable” act for the sixth time.

The potentially lethal treats were found off Dorset Street in the Anderston area of Glasgow by members of the public on Tuesday, making it the third time in the space of a fortnight.

The Scottish Society for the Prevention of Cruelty to Animals (SPCA) first appealed for information about similar incidents in March.

And now animal welfare inspectors have warned that it appears those responsible “won’t stop until an animal is hurt”.

Scottish SPCA Inspector Vickery said: “We are grateful that no animal was harmed by the biscuits and we are thankful to the vigilant members of the community who alerted us to these incidents.

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“This is the second time we have appealed for information. The first time biscuits were found was in March this year.

“This is a calculated and abominable criminal offence and we will do all we can to find the person responsible. It seems they won’t stop until an animal is hurt.

“Someone knows something and we are desperate to put a stop to this.”

In addition to the dog biscuits discovered laced with nails, there have also been reports of dogs ingesting poison in Alexandra Park, Dennistoun.