Confine your puppy to his, 'puppy-proofed' bathroom or an exercise pen and paper (or wee-wee pad) the entire floor. Put his bed, toys and food/water bowls there. At first there will be no rhyme or reason to where your pup eliminates. He will go every where and any where. He will also probably play with the papers, chew on them, and drag them around his little den. Most puppies do this and you just have to live with it. Don't get upset; just accept it as life with a young puppy. The important thing is that when you get home, clean up the mess and lay down fresh papers.
Individualised training is used with dogs that have an urgent or unique training problem such as fear, hyperactivity, aggression (and other related problems), separation anxiety, biting, excessive barking, insecurity, destructive behaviors, walking difficulties, and inappropriate elimination.[84][85] This type of training would normally be undertaken where the problem naturally occurs rather than a class situation. Class training can be effective in encouraging socialization and play with a peer group. Classes are often offered at a more affordable rate and can cover both problem behaviors and teach new skills. Classes can range from puppy and beginner training to more advanced training and skill training such as performing tricks or therapy work.[86]

Taxi your pup for about one month (until the pup is about 3 months old as this should give the pup enough time to develop some bladder and bowel control). By doing so, you will prevent many mistakes. At the same time you will train a stong preference in your pup to eliminate in your chosen spot. The pup will also learn that being picked up gets - kisses !
The process is the exactly same for older dogs as it is for puppies; prevent accidents from happening by using baby gates and a crate if possible, create a predictable schedule, learn to recognize your dog’s potty signals, accompany your dog outside and immediately reward for all outdoor elimination, properly clean any accidents and supervise your dog until you’re sure that he understands the rules.
A Hungarian dog training group called Népszigeti Kutyaiskola use a variation of model-rival training which they describe as the Mirror Method. The mirror method philosophy is that dogs instinctively learn by following the example of others in their social sphere. Core to the program is including the dog in all aspects of the owner's life and positive reinforcement of copying behaviors. Mirror method dog training relies on using a dog's natural instincts and inclinations rather than working against them.[71]
If you’re like me and have trouble keeping up with your pup at all times try using a tether. You can buy a tether from the pet store or simply do what I did and use a long lead or leash. If tethering your pup to you at all times is what it takes to make sure they’re not sneaking off then go for it. If you’re not keen on keeping your dog tethered you can use baby gates or closed doors to restrict your dogs access to the whole house.
Clicker training is a nickname given to a positive reinforcement training system based on operant conditioning. Clicker training can also be referred to as marker training. The system uses conditioned reinforcers which are able to be delivered more quickly and more precisely than primary reinforcers such as food. The term 'clicker' comes from a small metal cricket adapted from a child's toy that the trainer uses to precisely mark the desired behavior; however, some trainers use a whistle, a word, or even a light as the conditioned reinforcer.[63] The trainer delivers a primary reinforcer, such as a toy or treat, after the noise or signal. A common critique of clicker training is that it is prone to the overjustification effect.[64]
Electronic training involves the use of an electric shock as an aversive. Common forms are collars which can be triggered remotely, or that are triggered by barking, fencing that delivers a shock when a dog wearing a special collar crosses a buried wire, and mats that can be placed on furniture to deliver a shock. Some aids deliver an aversive such as a spray of citronella when triggered.[65] The use of electric shock aversives for training dogs is the subject of considerable controversy. Supporters claim that the use of electronic devices allows training at a distance and the potential to eliminate self-rewarding behaviour, and point out that properly used, they have less risk of stress and injury than mechanical devices, such as choke chains. Opponents cite the risks of physical and psychological trauma associated with incorrect or abusive use.[66]
Learned helplessness occurs when a dog ceases to respond in a situation where it has no option to avoid a negative event. For learned helplessness to occur, the event must be both traumatic and outside the dog's control.[53] Family dogs that are exposed to unpredictable or uncontrolled punishment are at risk of developing disturbances associated with the learned helplessness disorder. Punishment which is poorly coordinated with identifiable avoidance cues or response options, such as when punishment takes place long after the event, meet the criteria of inescapable trauma.[43]

Though it differs by each individual dog this is the time when most will come up with their own little way of letting you know they’ve got to go. It might be crying at your feet, ringing a bell you’ve set up or waiting at the door — just be sure to pay attention to these signals & follow up. Once your dog knows how to get your attention when he’s got to go you can relax a little and congratulate yourself on a job well done.
Young puppies can’t hold their bowels & bladders for long. If you come home to find that they’ve had an accident in there it’s quite possible that they can’t hold it that long. Generally puppies can hold their bladder for about one hour per month of age. So your 3 month old pup can probably only hold their bladder for about 3 hours. If you’re going to be away at work for long periods of time see if you can get a neighbor, relative or dog sitter to come over to let your pup out during the day.
Just so you know, a puppy is never completely housetrained until they are 6 months old. For some breeds, even later. This means that though you may be making tremendous progress housetraining, there will be "mistakes". Sometimes for reasons you can't figure out! Don't fret about it. Stay focused on the progress you are making. Your confidence in the techniques you are using to house train your puppy will ensure your success.

Operant conditioning (or instrumental conditioning) is a form of learning in which an individual's behavior is modified by its consequences. Two complementary motivations drive instrumental learning: the maximization of positive outcomes and minimization of aversive ones.[39] There are two ways in which behavior is reinforced or strengthened: positive reinforcement occurs when a behavior is strengthened by producing some desirable consequence; negative reinforcement occurs when a behavior is strengthened by avoiding some undesirable consequence. There are two ways in which behavior is decreased or weakened: negative punishment occurs when a behavior is weakened by not producing a reinforcing consequence; and positive punishment occurs when a behavior is weakened by producing a consequence that is a disincentive. In combination, these basic reinforcing and punishing contingencies provide four ways for modifying behavior.[40] Reinforcement increases the relative probability or frequency of the behavior it follows, while punishment decreases the relative probability or frequency of the behaviour it follows.

There also behavioral issues that can interfere with successful training. Urine marking is a normal dog behavior in which the animal will hike their leg and mark a certain area or object. With separation anxiety, the puppy may have accidents inside when you leave them at home alone. Some puppies become nervous or upset when their owners are away. Other puppies have a submissive or excitement urination problem. This causes them to spontaneously urinate during certain activities. Discuss these possibilities with your veterinarian or trainer if you're not getting positive results.[23]
Non-associative learning is a change in a response to a stimulus that does not involve associating the presented stimulus with another stimulus or event such as reward or punishment.[48] Habituation is non-associative learning. An example is where a dog that reacts excitedly to a door bell is subjected to repeated ringing without accompanying visitors, and stops reacting to the meaningless stimuli. It becomes habituated to the noise.[49] On the other side of habituation is sensitization. Some dogs' reactions to the stimuli become stronger instead of them habituating to the repeated stimuli or event.[50] Desensitization is the process of pairing positive experiences with an object, person, or situation that causes fear or anxiety.[51] Consistent exposure to the feared object in conjunction with rewards allows the animal to become less stressed, thereby becoming desensitized in the process. This type of training can be effective for dogs who are fearful of fireworks.[52]
If you’re like me and have trouble keeping up with your pup at all times try using a tether. You can buy a tether from the pet store or simply do what I did and use a long lead or leash. If tethering your pup to you at all times is what it takes to make sure they’re not sneaking off then go for it. If you’re not keen on keeping your dog tethered you can use baby gates or closed doors to restrict your dogs access to the whole house.
Researchers have described several reasons why the dominance model is a poor choice for dog training.[75] First, a relationship based on dominance is established to gain priority access to scarce resources, not to impose particular behaviors on the less dominant animal,[76] so the dominance model is irrelevant for most of the behaviors that people want from their dogs, such as coming when called or walking calmly on a leash.[75] Second dominance-submission relationships, once established, are constantly tested and must be regularly reinforced.[77] Thus people, particularly children and the elderly, may not be able to retain their rank and are at risk of being injured if they attempt to do so.[75] Third, dominant individuals gain priority access to resources, but only while they are present, establishing dominance over a dog does not guarantee its behavior when the dominant individual is distant or absent.[75]

In 1935, the American Kennel Club began obedience trials, and in the following years popular magazines raised public awareness of the benefits of having a trained pet dog, and of the recreational possibilities of dog training as a hobby.[19] After WWII, the increasing complexities of suburban living demanded that for a pet dog's own protection and its owner's convenience, the dog should be obedient. William Koehler had served as principal trainer at the War Dog Training Center, in California, and after the war became chief trainer for the Orange Empire Dog Club—at the time, the largest dog club in the United States—instructor for a number of breed clubs, and a dog trainer for the Walt Disney Studios.[20] In 1962 Koehler published The Koehler Method of Dog Training, in which he is highly critical of what he calls "tid-bit training techniques" based in "the prattle of 'dog psychologists'".[19] Amongst the training innovations attributed to Koehler is the use of a long line in conjunction with a complete absence of oral communication as a way of instilling attentiveness prior to any leash training. Koehler insisted that participants in his training classes used "emphatic corrections", including leash jerks and throw chains, explaining that tentative, nagging corrections were cruel in that they caused emotional disturbance to the dog.[21] Vicki Hearne, a disciple of Koehler's, commented on the widespread criticism of his corrections, with the explanation that it was the emotionally loaded language used in the book that led to a number of court cases, and to the book being banned in Arizona for a time.[22] Despite the controversy, his basic method forms the core of many contemporary training systems.[23]