Designer dogs or crossbreed dogs increased in popularity in the 2000s. This is likely because crossbreed dogs tend to combine some of the best elements of different dog breeds.
The names for these designer breeds are quite interesting! This is because their names are a portmanteau of the two baseline breeds. For example, a Schnauzer crossed with Beagle results in Schneagle offspring, and a Chihuahua who is bred with a Yorkshire Terrier will have a litter of Chorkie pups. So, at the risk of sounding like an opening line to a joke: what do you get when you cross a Shih Tzu with a Poodle?