A FIVE-month-old West Highland Terrier puppy disappeared from a garden in Harpham Road, Marshchapel, between 4.30pm and 5.30pm on Friday July 27.
It is not thought that the puppy could have escaped from the secure garden and the incident is being treated as theft by police.
Named Casper, the dog is microchipped and was wearing a black collar with a pattern of white bones on it.
Casper has a heart condition and is scheduled to have an operation this week so his owners are understandably very distressed and desperate for news of his whereabouts.
Anyone with information should contact Lincolnshire Police by dialling 101 and quoting the incident number.
Report crimes anonymously by contacting Crimestoppers on 0800 555 111.