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. 
#1 It’s not instant. A common misconception is that dog training collars give instant results that will have your pet trained within a day. This is completely false. Like all training methods, it will likely take a bit of time to complete, and you will need to be patient. Every dog is different, and they all have varying needs and forms of learning. So, keep at it, and don’t get frustrated when your dog isn’t immediately trained. 
Dogs expel most of their body heat from their mouths. When your dog pants, he's probably too warm, so he is regulating his body temperature. However, it's important to pay attention to panting, as he may do it when in pain as well. Help your pal regulate his temperature and make sure he's well hydrated before any physical activity–especially as the weather warms up. If your dog was injured, get him to the vet 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 vet. 

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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