Dog wagging tail

Is a wagging tail always the sign of a friendly dog? If your cat rolls on her back, does she really want you to rub her tummy? If your dog is “smiling” does that mean he is happy? As a veterinary behaviorist, I have to tell you, the answers to these questions might surprise you.

There are some common behaviors that our dogs and cats exhibit that many people often misinterpret. Let’s review some canine and feline body language in order to help you determine what your pet is really trying to tell you.

Weigh the Wag

For example, tail wagging is not necessarily a sign of friendliness. In dogs, a wagging tail is an indication that the dog is willing to interact, but that interaction can be either aggressive or friendly. In order to determine what the dog is “saying,” you need to look at the rest of the dog’s body posture to figure out if he is approachable or not. Are the dog’s ears pinned back and flat against the head, sort of like a seal’s? Is his body and/or head lowered? Is he avoiding direct eye contact? Is he holding his body still or is he perhaps leaning away from you? These are all signs that the dog is uncomfortable and wants to avoid further interactions. Also keep in mind that a dog may not always choose to leave your vicinity in order to avoid a confrontation. Just as some people might just turn away from someone to avoid a conversation rather than move all the way across the room, a dog might try to stand, turn his head or hold his body away from you if he is uncomfortable. On the other hand, if the dog is being friendly, you might observe that he comes over to you and presents his side or hindquarters to be petted or scratched. He may nudge your hand for attention or press his body up against you. Or, when you look at the dog or speak to it, he may move closer to you for more attention and not bark or growl as he approaches.

In cats, a “wagging” tail is definitely a sign of agitation. Cats don’t really wag their tails like dogs do. When relaxed, they tend to hold their tails quietly with minimal movement in comparison to a dog. So if a cat is moving her tail back and forth quickly two or three times in a motion I describe more as “whipping,” this might indicate agitation. It means something has caused the cat to be aroused, and it is best to give her some space and not interact with her until she has calmed down.

Cat on back

Tummy Troubles

Another behavior that we as humans often misread is when an animal rolls over onto its back. This is not always a sign that he or she wants a tummy rub. When a dog lies on his back, he is showing a sign of utter submission and appeasement in the dog world. People have chosen to interpret it as a sign the dog wants a belly rub. Many dogs may simply like attention, will take it any way they can get it and have learned to love their belly rubs. Other dogs, however, may feel really threatened by someone leaning over them while they are showing their most ultimate form of appeasement. Submissive behavior is deferential behavior used to tell the other dog that he wants to avoid conflict or a confrontation and that he needs space. When a dog rolls over onto his back, I typically ask him to sit up first before I give him attention to avoid this potential problem. Some people are really surprised when they try to pet a dog’s belly and he growls or snaps. While some dogs have been conditioned to receive attention in this manner and maybe even have learned to like it, always keep in mind that in the natural order of things, this is actually a signal saying, “give me space” or “do not hurt me.”

In cats, this is even more true. When a cat rolls over to show you her abdomen, it is a sign that she feels really comfortable with you. It is not, however, an invitation to rub her belly. Many people are surprised when they try to do so and the kitty grabs their hands and bites them or kicks out at their hands with their back legs. Like a dog, a cat who rolls over on her side is often indicating comfort and deference (a submissive behavior). She is indicating that she is not aggressive and is trying to appease you or another cat. Despite how we may like to interpret the behavior, however, it is important to keep in mind, especially with cats, that she does not necessarily want you to follow up with physical contact!

Dog smiling

Smile vs. Snarl

What is a smile in a dog? For many people, it is a dog panting with an open mouth and a relaxed expression on his face. For other people, it is when a dog approaches them and shows them their teeth prior to receiving attention or getting a treat. In these situations, the dog’s lips are pulled back toward the rear of the jaw exposing some of their pearly white incisors and canines. This is different from a snarl, in which the lips are lifted up vertically and the nose becomes wrinkled to show you the canines. This is usually accompanied by a stiff facial expression and body postures. What some people consider to be a smile, however, is not necessarily an indication of a happy dog. In the first described scenario, that might be the case. But dogs express their emotions in different manners compared to humans and it’s best to be very cautious. Keep in mind, we are the only species known to bare our teeth in order to show happiness. In other animal societies, baring teeth is a sign of threat!

Dog with raised fur

Hair-Raising Experiences

Hackles being raised in a dog (veterinarians call this “piloerection”) is not always an indication that the dog is about to attack another dog. Dogs often raise their hackles when they are being wary and cautious but not always before they attack. A dog may approach another dog slowly with his hackles raised, then greet the other dog with a play bow! When a cat has his tail “puffed” out, that is a sign of high arousal as well. It also does not always mean the cat is about to attack. The puffed tail can occur due to the sight of another cat or animal or upon hearing a certain sound. My cats, for example, have exhibited “piloerection” when they see stray cats on our deck or hear strange noises coming from my husband’s laptop. However, in both species, I would recommend monitoring the animals carefully and limiting interactions with them until they have calmed down. If a dog or cat is in a state of high emotional arousal, give him or her space to relax to avoid setting off an undesirable reaction.

I hope these comments have been useful and given you some helpful insight into your pet’s behaviors. Knowing what your pet’s behavior really means can only help build a stronger relationship between you and your four-footed companion — and that is the goal of every veterinary behaviorist.

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