Your pup's actions tell you a lot about their mood. And although you may not be fluent in the canine tongue–short of what it means when it salivates–you do need to learn how to interpret dog behaviors and what they mean. Have you ever witnessed your dog licking certain textures or circling the same spot in front of you? There are many reasons a specific dog state of mind or health concern may cause them to do these things. Once you pay attention to this behavior, you'll be able to help.

1. Bad Breath

Dogs aren't known for having wonderfully minty breath, but if you notice a marked change with even a little halitosis, it might be time to take a trip to the veterinarian. There could be something wrong with your dog's oral health.

A change in the smell of your dog's breath may also be a cause for concern with respect to their gastrointestinal tract, liver, or kidneys. If your dog's breath smells of urine, for instance, they could have a kidney problem. Sweet-smelling breath could be a sign to veterinarians that your dog may have diabetes (especially if they're drinking more water and urinating more often). Your dog's overall mood may appear happy, but if their breath has changed, pay attention - let your veterinarian know.

2. Biting

Puppies may nip at you as they learn how to communicate with their pet parents. This usually happens while playing, as young dogs often communicate with their mouths when they interact. It may also happen during training, or for simply no reason you can identify. If your young one is nipping regularly, though, it's important to stop it before it develops into more dog behavior problems down the line.

Dogs bite out of anxiety, fear, or aggression. Can you identify which is motivating your pet to do so? Is their mood influencing their actions? If you're having dog behavior issues and trying to teach them not to bite, consider working with a professional trainer, or better yet, a veterinary behaviorist. Your veterinarian should be able to recommend one for you.

3. Circling

Dogs who can't stop walking in circles may have a health issue. Yes, sometimes it's fun to chase your tail, but if your pup can't shake the compulsion, there could be a problem beneath the surface. Ear infections may cause circling, but compulsive tail chasing may occur with bull terriers.

Of course there may be other reasons your buddy is circling. Older dogs may suffer from idiopathic vestibular syndrome, and, not to alarm you, but all dogs are at risk for poisoning or a brain tumor. Only your veterinarian can determine the cause of your dog's circling, so get them in for a checkup.

4. Digging

Dogs dig in the ground for many reasons: to escape, to track animals, to make a cool spot to lie, or to hide something important to them. However, some dogs "dig" inside as well. Have you ever noticed your dog scratching at the blankets or couch in order to find the perfect place to lie down? This weird dog behavior happens most often at night and during nap times, and it is completely normal.

If your dog's digging starts to bother you, or damage your furniture, consider working with a professional trainer to reduce this stubborn habit.

5. Eating poop

Dogs eat feces for many reasons; it can be a normal (while distasteful to us) dog behavior. Young dogs may watch their mother clean them (who ingests feces as a result), and mimic her. Fear may even cause your dog to eat feces if he's afraid of the repercussions. Then again, your dog may just be curious. They may smell certain scents in the feces and wonder what it tastes like.

Eating poop can also be an instinctive solution to a nutritional deficiency. Contact your veterinarian for help selecting a high-quality dog food, especially if your dog is eating poop or you have any other reason to be concerned about a nutritional deficiency.

6. Head Pressing

If you notice your dog pressing their head against the wall or another firm object, there's a need for your immediate attention. A dog head pressing on floor is a common sign of numerous serious problems, such as toxic poisoning or brain disease. Make an appointment with your dog's veterinarian right away.

7. Panting

If you've ever wondered, "why does my dog pant so much?" it can be for a few possible reasons. Dogs expel most of their body heat from their mouths. When your dog pants, they're probably too warm and are trying to regulate body temperature. However, it's important to pay attention to panting, as they may do it when in pain as well. Help your pal regulate their temperature and make sure they're well hydrated before any physical activity–especially as the weather warms up. If your dog was injured, get them to the veterinarian immediately. Some other health problems may also show increased panting as a sign, so if you have a question, don't hesitate to contact your veterinarian.

8. Sitting on Your Feet or Between Your Legs

What does it mean when your dog sits on you? This is often mistaken for possessive behavior, but is most often a sign of anxiety or nervousness. "Dominance" is rarely the problem; your dog is probably trying to feel safer by staying close.

Anxiety is often more than a dog trainer is qualified to help with so discuss the behavior with your veterinarian and see if your dog would benefit from a referral to a veterinary behavior specialist.

9. Scooting

Have you ever watched your dog drag themself across the floor . . . with their bottom on the ground? It may seem funny (or kind of disgusting). But it is also called scooting, and it means there's something irritating your dog's anus. It's possible that your pup's anal sacs are full and need to be expressed.

A dog who's a grass-eater, or likes to lick around the house, could have strands of grass or hair trapped in their anus that they're rubbing the ground to get out. This is the least-severe reason for scooting but the easiest for you to help take care of.

If your dog's anal sacs aren't backed up, the problem could be irritation for some other reason. Allergies may only show up as an itchy rear. While it's common to blame worms, it is an uncommon reason for the behavior. Check with your veterinarian to for help diagnosing why your dog is scooting, and, while you’re there, be sure your pal is on an appropriate parasite prevention program.

10. Urinating

If your dog is house-trained, it may come as a surprise if you see them urinating in your home. Typically, dog behavior changes for a reason. Formerly reliable dogs who suddenly begin urinating inside need your attention! This is a sign that something may be very wrong with your furry friend, and when they relieve themselves frequently–even if they're in the correct location–it can be a sign of a urinary tract, bladder, or kidney infection. In an older dog, it may even be a sign of dementia.

11. Yawning

Although you might think lack of sleep would cause dog yawning, the meaning isn't always that they're tired. They may be interested in napping, but could also be showing a sign of fear or stress. If your dog appears to yawn at an increased rate around a new person, don't rush the introduction. They're either picking up vibes they don't feel comfortable with or is fearful for a less-obvious reason. No matter what the case, a forced introduction isn't a good idea.

12. Anxiety Shows in Many Ways

Signs of anxiety include shaking, tail tucking, escapist behavior, defecating in the home, biting or injuring themself, barking, and many more, according to PetMD.

Because they're technically pack animals, your dog may become fearful when left alone. If separation anxiety is a chronic issue for your dog, you'll both need to learn how to create a relaxing environment when you leave the house. Consider taking your dog for a long walk or play a rigorous game of fetch in your backyard to tire them out before you go. Don't make a big deal out of your departure, either. If you're still having trouble with separation anxiety, consider involving a professional who can work on behavioral training.

Personality changes in dogs can come from a myriad of circumstances. If your dog is experiencing any of these behaviors, and they're not typical of your pet, don't hesitate to make an appointment with the veterinarian to rule out any systemic medical issues. Your once social, extremely energetic dog won't suddenly become lethargic and withdrawn. If they do, they're asking for some help.

Erin Ollila Erin Ollila

Erin Ollila believes in the power of words and how a message can inform—and even transform—its intended audience. Her writing can be found all over the internet and in print, and includes interviews, ghostwriting, blog posts, and creative nonfiction. Erin is a geek for SEO and all things social media. She graduated from Fairfield University with an M.F.A. in Creative Writing. Reach out to her on Twitter @ReinventingErin or learn more about her at http://erinollila.com.