According to Animal Behavioral College, Inc.

Bred to be Active and Tenacious -This enables them to hunt vermin and not back down if attacked. This characteristic may make these dogs difficult for inexperienced dog owners to handle. These dogs may respond aggressively to common corrections that most dogs would back down from. This enables them to hunt vermin and not back down if attacked. This characteristic may make these dogs difficult for inexperienced dog owners to handle. These dogs may respond aggressively to common corrections that most dogs would back down from.

High Need for Daily Exercise - Terriers may be seen as destructive and hyper when not given enough exercise or acceptable work to do like Fetch, obedience and tricks.

Alert and Agile - These dogs are quite fast, which can make them difficult for their owners to keep up with. Inexperienced owners may feel left behind by these dogs, both mentally and physically. These dogs are quite fast, which can make them difficult for their owners to keep up with. Inexperienced owners may feel left behind by these dogs, both mentally and physically.

Digging and Hunting Instincts may Cause Problems - These dogs may become destructive if their energy is not properly channeled.

Can be Dog/Animal Aggressive - Since many terriers were bred to hunt and kill vermin, they may hunt and try to kill small animals they encounter. Some terriers have been bred to fight other dogs.  Digging and Hunting Instincts may Cause Problems - These dogs may become destructive if their energy is not properly channeled.

Can be Dog/Animal Aggressive - Since many terriers were bred to hunt and kill vermin, they may hunt and try to kill small animals they encounter. Some terriers have been bred to fight other dogs.  Since many terriers were bred to hunt and kill vermin, they may hunt and try to kill small animals they encounter. Some terriers have been bred to fight other dogs.