Thunder, loud noises, new places, the dreaded veterinarian---many things can make your dog nervous. Different dogs show their fear in different ways. If you don't know a dog well and he appears nervous, proceed cautiously. A nervous dog may be nip or bite out of fear. Speak and act calmly around a nervous dog; don't transmit more anxiety or reward fearful behavior.
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Panting
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Your dog may breathe heavily when she's nervous. Anxiety can cause an elevated heart rate, causing her to pant. Offer plenty of fresh water. Excess panting can dehydrate her.
Growling
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Nervous dogs are scared and may bite. Even if his tail is wagging, growling is a warning sign; keep your distance.
Pacing
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Like people, dogs relieve stress by moving around. Pacing lets your dog blow off steam in a confined area. Obsessive pacing due to separation anxiety should be addressed by veterinarian or behavior specialist.
Drooling
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Some dogs, particularly the jowly types, drool when they are nervous. Anxiety can cause increased saliva production. Messy but harmless.
Whining
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Whining is a common sign of nervousness. Whining is an alarm sound--your dog is trying to alert you that he thinks something is wrong. Putting your dog on his leash--relieving him of the alerting responsibility--may help quiet him.
Barking
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Barking is a warning sign to the rest of the pack (namely you) that something must be done hurriedly. Never yell at a barking dog; she'll think you're barking, too.
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