Pessimistic dogs appear to be more prone to engage in unwanted behaviors, such as barking and destruction.

悲观的狗更易做出不可爱的行为，如吠叫和破坏。

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Pessimistic dogs are more likely to engage in unwanted activities, such as barking, destruction, and toileting when and where they shouldn't.

悲观的狗更容易有不受欢迎的行为，如吠叫、破坏，在不合适的时间地点大小便。

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First, each dog was studied to see whether it suffered separation anxiety - behaviour such as barking or scratching at the door when left alone.

首先，每个狗进行了研究，看它是否遭受分离焦虑-如狂吠或抓时在门口只剩行为。

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The site deals more with curbing specific bad behaviors, such as excessive barking or chasing cats, than actual training tips.

CNN: Site-Seer: Fetching an obedient dog from the Web

Tourette's syndrome is marked by movements such as shoulder shrugging, eye blinking and head jerking, as well as bizarre vocal tics including barking and uncontrollable outbursts of profanity.

ECONOMIST: Great drug, shame about the delivery system