Wire Fox Terriers are relatively small dogs at an average of 16 to 18 pounds. Dogs of the breed tend to be upbeat, friendly and full of personality. These bright dogs are smart, athletic, and independent. While they can be challenging to train, doing so is possible and they make excellent companions who are fun to have around. Wire Fox Terriers need both physical and mental activity to ensure their overall health; fortunately, there are many things that your pup will enjoy engaging in, some of which are activities that will allow you to spend time together and further develop your relationship.