The Border Collie is a working and herding dog breed that can be anywhere from 27 to 42 pounds and 18 to 22 inches tall. They are incredibly intelligent, acrobatic, and athletic - which makes sense as they were bred in Scotland to herd sheep.
Australian Shepherds are herding dogs initially bred in the US (confusing, I know). They can be between 18 to 23 inches tall and weigh anywhere from 35 to 70 pounds.
English Bulldogs are short but stocky, at around 15 inches tall and 40-50 pounds. They are kind and friendly dogs that are often quite docile. They need moderate exercise along with a careful diet.
Labrador Retrievers are one of the most popular dog breeds in the world. They can be around 21 to 24 inches tall and weight between 55 and 80 pounds, so some of them can be a bit closer to a larger dog breed size.
Siberian Huskies were bred as sled dogs and are used to working in packs, so most of them get along well with other dogs. Siberian Huskies can be anywhere from 20 to 23 inches tall and weigh between 35 and 60 pounds.
The iconic Dalmatian can be anywhere from 22 to 24 inches tall and weigh between 35 and 71 pounds. While they're famous for their role in Disney's 101 Dalmatians.
As far as medium dog breeds go, Poodles can be around 15 inches tall and weigh between 40 and 70 pounds. These are the standard poodles, by the way, not the miniature or toy breeds.
Boxers can sometimes be more large than medium, but on average are between 21 to 25 inches tall and 65-80 pounds. Boxers are loyal, affectionate, and playful, and can sometimes be known for being quite silly.