Chugs are the result of crossing two pedigree dogs, namely the Chihuahua and the Pug and these charming little “designer dogs” have only been on the scene for the last 10 to 15 years or so. However, they soon made an impact with people both here in the UK and elsewhere in the world, thanks to their adorable looks and their kind, sweet natures. Although new to the dog world, the actual origins of the Chug are a bit of a mystery with no one actually knowing who first started crossing Pugs with Chihuahuas to produce them.