My adopted chihuahua is aggressive and bites. What can I do?

Aggression and fear are complicated. Some dogs can make some progress with appropriate guidance and consistency. For such guidance you will need to work with a trainer or a behaviorist. They must show you how to read his body language and how to respond in a fashion to modify their behavior. Certainly you can read many books about training and canine behavior as it is all helpful but likely you will still need professional assistance. Best of luck and please feel free to post any additional questions.

Hi there! I'm sorry to hear that you're having this problem with Buffy. It's not unusual for behavioral issues to take a few weeks to show up in a newly adopted dog - there is often a "honeymoon period" while they're still getting comfortable and adjusting to their new home, before these issues start to emerge. Aggression towards other dogs and humans is a complex behavioral issue that's difficult to address properly in a forum like this, but I can try to give you some general information that may be helpful. Treatment for aggression issues is generally based on identifying what situations tend to trigger the aggressive behavior - then either finding ways to avoid them, or working with the dog to teach her to respond differently using reward-based training techniques. If this is something you want to work on, I would recommend making an appointment with a veterinary behaviorist who can evaluate Buffy in person and help you put together a detailed treatment plan to address her aggressive behavior. For now, if the aggression only happens with dogs and people she doesn't know, I would recommend keeping her separated from visitors for now until you are able to get a more detailed plan in place to work on the problem. You can search for a board-certified veterinary behaviorist in your area here: www.dacvb.org

I'm sorry you are having these problems with Pepper. Firstly addressing her breed, sometimes the humane society gets a litter of pups with no information about the parents breed types - they use their best judgement to guess what breed the pups are, so they can get it wrong. From the picture, Pepper has the smooth coat of a miniature pincher or Italian greyhound, but she is larger than those breeds. There is a genetic DNA test that can be run which is developed by Mars Scientific. It is available at Banfield Pet Hospitals (and costs around $90 plus office visit fee). With regards to her behavior, this is more of a concern. I suspect you will be best to have a consultation with an experienced pet behaviorist, or vet that specializes in behavior, as I would hate for someone to get bitten badly by her. Try to determine the situations that seem to trigger her aggression, and attempt to prevent similar events occurring (eg. shouting or arguing, meal times, disciplining her). You could also try using a product called "Adaptil" which is a patented pheromone formula and can help lessen the severity of some behavioral problems. It comes in a collar or a plug in diffuser and is made by CEVA. I hope these suggestions can help.

I am sorry you are struggling with Chico. I would highly recommend bringing a trainer into the house after making sure a physical exam by a veterinarian is normal. Behavioral issues/ training takes a lot of time and patience. I feel having someone come into the home and observe the situations where he is anxious and aggressive will help. Also recommend getting him neutered as soon as possible.

I'm sorry to hear that this happened! How upsetting for you and your cousin. The situation you describe - a child coming up behind a dog and startling it, particularly when food is involved - is an extremely common trigger for bites. Any dog will bite if it feels scared or threatened. Our responsibility as adults is to make sure that these situations don't happen. For safety reasons, I would recommend keeping Max separated from any visiting children from now on to prevent this from happening again. Also, in the future, please don't hit him or scold him for reacting this way - the aggressive behavior was prompted by fear, so punishment will only make him more tense and defensive around kids in the future. This is likely why he growled at your friend once he was back in the house - he was stressed and upset, and already "on-edge" from everything that had happened before. If you want to try and work on this issue through training, I would strongly recommend getting help from a veterinary behaviorist who can evaluate Max in person and help you put together a detailed plan for him. Training for aggression issues is generally focused on teaching the dog to associate good things with whatever he is currently afraid of (such as children, visitors, etc.), and should not involve punishment of any kind. Management is also extremely important to ensure that everyone stays safe, for dogs with any history of biting. You can search for a board-certified veterinary behaviorist in your area here: www.dacvb.org

If the two are a bonded pair, I would consider trying to introduce the more aggressive one toe the other animals alone without her buddy. See if this makes any difference - she may have been being protective. Unfortunately, this doesn't necessarily resolve your problem. While I hate to say it, you only just got these guys and they may not be best suited for your home. If I were you, I would contact the shelter or rescue from which you acquired them and let them know what is happening. Usually, if the place is reputable, they will understand and take the dogs back in order to place them somewhere else. Rescuing an animal should not become a big project for you if it was not meant to be one in the first place. If you decide that you are going to keep them anyway, they will need to be introduced to your other animals very slowly and carefully, and under strict supervision for an extended period of time. The use of positive reinforcement training will hopefully allow them to coexist at some point. There are no guarantees however. Hope this helps. Let me know if I can assist you in any further manner.

I hate to hear this is happening. If you do not want to rehome her, I recommend to work with a professional trainer because this will give you the best results the fastest. 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. A professional trainer is fully capable of reading the body language and then teaching you how to modify this behavior. 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.