Why does my 1-year-old dog suddenly growl and bite without warning?

Oh dear! That is a worry for sure! It's really important that you don't get hurt, because dog bites can be pretty serious. I would suggest making an appointment with your vet to talk about possibilities. They might be able to link you up with a behaviorist, or dog trainer that could help a lot. There also could be medications that might help. Or, like you said, there could be a medical problem that is upsetting him.

I hate to hear this is happening and unfortunately, it's impossible to know the real cause of the behavior without being able to observe it. Canine aggression is a complex behavior as it can stem from dominance, possessiveness, fear, anxiety, resource guarding or a combination. Most people are not familiar with reading canine body language and training. Because of this, I recommend to work with a professional trainer. Researching on your own will also be helpful. Familiarizing yourself with canine body language and dog training can help you to recognize what your pet is trying to say. You can find many books written on the topic and there is a trainer named Victoria Stilwell who I think is particularly helpful. I also recommend to have Cezar neutered. Intact males tend to be more aggressive but again, aggression is complex and it may not solve the problem. Best of luck.

Oh dear! I'm sorry to hear that you're having this problem with Onyx. Human-directed aggression in dogs is a complex behavior issue that can have many different causes, so I'm afraid it's difficult to say what might be causing this without a full behavior history and an in-person evaluation. This sounds like a very dangerous situation for you, so if you want to keep Onyx, I would strongly recommend making an appointment with a veterinary behaviorist who can evaluate him in person and help you determine what is causing this behavior. Aggression issues like this can be treatable in many cases with careful management and a good training plan to work on the problem, but this should only be attempted with assistance from a trained professional. You can search for a board-certified veterinary behaviorist in your area here: www.dacvb.org

If this is a sudden or new behavior that happened out of the blue, and Toby is now biting and snapping when picked up or handled, I would be concerned that there is something going on such as pain or illness. Often times, a sudden behavioral change can indicate pain or another underlying condition. A good first step is to schedule an appointment with your vet to rule out any health issues that could be causing this. If Toby checks out healthy and he is still acting aggressive and trying to bite you or other animals, I would seek out the help of a trainer or veterinary behaviorist in person. Aggression is a very serious and complex issue and having someone there in person that can observe, assist and provide a tailored plan to help change Toby's behavior is best. Veterinary behaviorists are great as they are able to prescribe any needed medication in addition to a training routine to help create a safer, stress-free environment. You can visit this site to learn more about veterinary behaviorists and find one in your area: http://www.dacvb.org/about/member-directory/

Hello, sorry to hear about Commander. Aggression may indeed by a difficult behavior to manage and very important as it can create a dangerous environment for himself and those around him. Here are some tips on aggression and how to manage this. Hope this helps and best of luck. Introduction Aggression is a common problem faced by many dog owners. It is commonly misunderstood to be based in dominance. In actuality, there are various reasons that dogs can react aggressively. Most commonly these acts are based in fear or anxiety. This handout, will attempt to help you differentiate whether your dog’s aggression is based in dominance or another stimulus, like fear or possession. However it is not meant to replace visits and discussions with your veterinarian. Common types of aggression • Fear aggression: Many commonplace human behaviors are threatening gestures to dogs, but their reactions are often times very subtle and easily missed by most people. Anything that can cause your dog to feel distressed or uneasy can illicit an aggressive reaction. Such things include: sustained eye contact, pressure over the top of the head, lifting the dog, bending over the top of a dog, certain force-based training techniques, or trying to take something of high value away from the dog. • Territorial aggression: Dogs can react aggressively when a person comes into an area that it regards as its home. There is often a basis of anxiety in dogs that have territorial aggression. • Possessive aggression: When aggression is directed toward a person that the dog views is approaching something of high value (food, toys, family members). • Redirected aggression: When the dog is frustrated by the inability to reach an object or person that elicits its aggression and instead acts aggressively toward a person that is within reach. • Dominance aggression: True dominance aggression is very rare. Most often aggressive acts are based out of another type of motivation. Usually what is assumed to be dominance aggression is actually based out of fear or anxiety. What is your dog’s motivation for its aggression? It is important to watch the body posture of your dog during a time of aggression to determine the underlying emotional state of the dog causing the aggression. Here are some examples of what to look for: Fearful or submissive postures • Avoiding eye contact • Lowered head and tail • T ense body posture • Ears to the side, back or down • Horizontal lip retraction • Licking lips • Yawning • Crouched body posture • Moving slowly or freezing • Submissive urination Dominant postures • Sustained eye contact • Ears erect and forward • Vertical lip retraction • Forward-leaning body posture

I hate to hear this is happening. Canine aggression is a complex behavior as it can stem from dominance, possessiveness, fear, anxiety, resource guarding or a combination. Most people are not familiar with reading canine body language and training. Because of this, I recommend to work with a professional trainer. Researching on your own will also be helpful. Familiarizing yourself with canine body language and dog training can help you to recognize what your pet is trying to say. You can find many books written on the topic and there is a trainer named Victoria Stilwell who I think is particularly helpful. Best of luck.

Biting aggressively is a serious concern and a very complicated thing to deal with. Leash aggression can sometimes manifest and be redirected toward the person putting on the leash, however if this suddenly happened out of the blue I'd be concerned. A good first step with any behavioral issues that comes on suddenly is to schedule a vet visit to rule out any issues such as pain or illness. Something wrong such as a slipped disk causing pain in the neck or shoulders may make having Griffy's collar or neck handled painful, causing him to bite. If he checks out healthy, talking with a trainer or behaviorist in person is a good next step. They can work with you on a plan to gradually reintroduce the leash to Griffy through positive experiences (such as giving a treat when you bring out the leash, gradually getting him used to it again, etc) and can observe in person what exactly is going on to better tailor the plan. A veterinary behaviorist can also work on both medical treatment and behavioral treatment at the same time to make things less stressful for both you and Griffy. If he is attempting to break the skin while you put the leash on, refraining from doing so until you've talked to a trainer or behaviorist in person is best. You can find a list of local behaviorists in your area by checking out this link: http://www.dacvb.org/about/member-directory/