Although you might think he needs some sleep, a dog yawn doesn't usually mean he's tired. He may be interested in napping, but he 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. He's either picking up vibes he doesn'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.
Yes, a training collar is completely safe for your dog. This is because they only use sound, vibration, or citronella spray. Each of these is completely harmless and designed to give your dog a surprise as opposed to an electric shock. They are effective for training, and they will not cause increased aggression because your dog is not feeling any pain, they are just a little startled by the sudden sound, sensation, or smell. 
Mop up any accidents with a paper towel and immediately bring a small piece of the soiled paper, along with your dog, to the potty place. Place the paper towel in the location you would have liked him to go potty and encourage him to sniff it while praising him. If you can, leave the soiled paper behind so that your dog can smell it again the next time you return.
Yes – with a warning. Most bark collars respond to a bark with a negative stimulus: citronella spray, ultrasonic sound, or a brief shock. The problem, and the warning, is for homes with multiple dogs or even dogs nearby. For this reason, many bark collars come with adjustable levels of sensitivity, making it harder to set off or easier, depending on your specific situation. You don’t want your dog getting negative reinforcement when another dog is misbehaving; of course because it’s cruel but also because it will confuse him and make the collar worthless. So use these collars carefully and never when he’s in the company of other untrained dogs.
Training collars typically use vibrations or static simulation (or a mild electric shock) to foster obedience, whether you’re trying to stop an aggressive behavior or teach your dog to walk with a leash. While many of these products can be expensive, this one from Mockins checks all the major boxes and comes at a low cost. Fitting dogs 15 pounds or larger, it offers 100 levels of vibration and static shock, with the delivery preceded by a warning tone. It’s also waterproof and fully rechargeable. Dog Training

Unlike other domestic species which were primarily selected for production-related traits, dogs were initially selected for their behaviors.[57][58] In 2016, a study found that there were only 11 fixed genes that showed variation between wolves and dogs. These gene variations were unlikely to have been the result of natural evolution, and indicate selection on both morphology and behavior during dog domestication. These genes have been shown to affect the catecholamine synthesis pathway, with the majority of the genes affecting the fight-or-flight response[58][59] (i.e. selection for tameness), and emotional processing.[58] Dogs generally show reduced fear and aggression compared to wolves.[58][60] Some of these genes have been associated with aggression in some dog breeds, indicating their importance in both the initial domestication and then later in breed formation.[58] Dog Training


This training collar actually uses one of the most popular and effective forms of correction; citronella spray. What this means is that when the dog barks, the microphone in the box on the collar will be activated; releasing a burst of harmless citronella into the room. Dogs are not too fond of this odour, and they will associate barking with the smell. 

Consideration: Many little dogs generally don’t like to rock the boat. This is especially true if they’ve been punished for accidents. A lot of people think punishing works because their dog or pup looks guilty. Well, that guilty look is just fear. And it doesn’t work; why else would you be reading this article? Often a little dog will make it easy on everyone and potty in a remote corner of the house. Think back: was there a time your puppy nipped, barked, or jumped at you repeatedly? Don’t ignore it—that’s the doggy equivalent of a toddler’s crotch grasping or body squirm. Our dog will nip, jump, and bark at you to tell you he’s gotta go!

Emotional contagion is linked to facial mimicry in humans and primates. Facial mimicry is an automatic response that occurs in less than 1 second in which one person involuntary mimics another person's facial expressions, forming empathy. It has also been found in dogs at play, and play sessions lasted longer when there were facial mimicry signals from one dog to another.[12] Puppy potty Training
In 2004, a study reviewed 5 other studies of feral dogs published between 1975 and 1995 and concluded that their pack structure is very loose and rarely involves any cooperative behavior, either in raising young or in obtaining food.[82] Feral dogs are primarily scavengers, with studies showing that unlike their wild cousins, they are poor ungulate hunters, having little effect on wildlife populations where they are sympatric.[83]:267 However, several garbage dumps located within the feral dog's home range are important for their survival.[84] Even well-fed domestic dogs are prone to scavenge; gastro-intestinal veterinary visits increase during warmer weather as dogs are prone to eat decaying material.[85] Some dogs consume feces, which may contain nutrition.[86][87] On occasion well-fed dogs have been known to scavenge their owners' corpses.[88] Puppy potty Training
Loud sound/ultra sonic. This deterrent will set off a loud sound or an ultra sonic tone that will surprise your dog when he’s caught being a bad dog. If reviews are to be believed, this is the least effective of the most commonly used deterrents but it’s also the nicest, so if you’re feeling guilty this may be your solution. Often a beep is combined with another type of deterrent and that seems to be more effective, though.
Resource guarding is exhibited by many canines, and is one of the most commonly reported behaviour issues to canine professionals.[50] It is seen when a dog uses specific behaviour patterns so that they can control access to an item, and the patterns are flexible when people are around.[51] If a canine places value on some resource (i.e. food, toys, etc.) they may attempt to guard it from other animals as well as people, which leads to behavioural problems if not treated. The guarding can show in many different ways from rapid ingestion of food to using the body to shield items. It manifests as aggressive behaviour including, but not limited to, growling, barking, or snapping. Some dogs will also resource guard their owners and can become aggressive if the behaviour is allowed to continue. Owners must learn to interpret their dog's body language in order to try to judge the dog's reaction, as visual signals are used (i.e. changes in body posture, facial expression, etc.) to communicate feeling and response.[50] These behaviours are commonly seen in shelter animals, most likely due to insecurities caused by a poor environment. Resource guarding is a concern since it can lead to aggression, but research has found that aggression over guarding can be contained by teaching the dog to drop the item they are guarding.[51] go here for more
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