These dogs are considered to be the most aggressive

[post_page_title]Jack Russell terrier[/post_page_title]
There are many different types of Jack Russell terriers that can be found all around the world, but the breed is all thanks to one man and his dog.

Jack Russell terrier

The priest was searching for the perfect hunting dog and finally found what he was looking for in 1819. Amazingly, these small dogs can reach impressive heights as an adult can jump up to five feet high in the air. However, their high energy levels and small size mean they can efficiently run rings around families if they’re not careful.

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