Detective McGruff Sniffs Out a Thief by Megan Durand, illustrated by John Sullivan, 1983.

Sniffy books, or scratch-and-sniff books, were popular during my early childhood in the 1980s, and they are still being made today. Scratch-and-sniff books are picture books with special patches that release a scent when they’re scratched. Kids like interactive books, so it can be fun for them to scratch a flower or some food in a picture and then smell it. I know from my old books that these scented patches eventually wear out, although I’m amazed that some of them still have a scent more than 30 years after the books were originally made. I had expected that the ones that my brother and I liked and scratched the most would be the ones that would eventually wear out the fasted, but it also depends on the strength of the original scent. The milder, more subtle scents are often more difficult to smell decades later. Scratching a little harder can sometimes help. This picture book is a mystery story, and I thought that it was clever, using the sniffy patches as part of the mystery story.

Mrs. Tabby loves shopping, but she often forgets to pay attention to her purchases while she’s looking at other things. One day, someone steals her shopping bag while she’s trying on hats at a sale. It’s terrible because the bag contained the chocolate cake for her son’s birthday.

Fortunately, Detective McGruff is nearby when Mrs. Tabby realizes that her bag is missing. Unfortunately, finding it isn’t going to be easy because many people are carrying blue shopping bags that look like hers. Mrs. Tabby isn’t sure what to do, but McGruff decides to use his nose to sniff out the correct bag.

McGruff approaches various shoppers and gives their bags a sniff. All of the bags look alike, but readers can scratch and sniff the special patches on each bag and try to guess what they contain before McGruff reveals the truth.

After sniffing several bags, McGruff eventually locates the one that smells like chocolate and finds the cake. But, curing Mrs. Taffy of being forgetful is another matter.

Detective McGruff, or McGruff the Crime Dog, was created in the early 1980s as a mascot for anti-crime messages from U.S. police and law enforcement agencies through the National Crime Prevention Council, including anti-drug messages and information related to the issue of child abduction. Sometimes, police use McGruff costumes when visiting schoolchildren to talk to them about crime.