Dogs often hide their toys and treats out of a natural instinct. As descendants of wolves, dogs have an innate tendency to hoard and guard the food and things they possess to ensure they have a surplus for the future. This is a survival strategy in which dogs bury or hide extra food in the ground or around the house to store it and prevent it from being stolen by other animals.
In addition, some dogs may hide their toys and treats because of anxiety, stress or health problems. Dogs suffering from nausea, lack of appetite or other medical problems may hide food rather than eat it. Anxious dogs may also hide their objects to feel more secure.
Some dog breeds, such as dachshunds, beagles and terriers, are genetically more likely to hide and bury food and toys than other breeds. This is because these dogs have historically been bred to hunt and chase small prey, behaviours that involve hoarding and hiding food.
In general, hiding treats is a natural dog behaviour, but it can become problematic if taken to an extreme. Providing dogs with appropriate toys, a controlled feeding environment and addressing any health or anxiety issues can help curb excessive hiding behaviour.