Have you given up hope of having a house-trained dog? You're not alone. Many people share their homes with adult dogs that are not completely house-trained. Incomplete house-training can usually be blamed on inconsistent humans, but occasionally a medical condition such as a bladder infection may be the culprit. This behavior can be eliminated, but it takes practice, patience and consistency.
Dogs can learn at any age
No matter your dog's age or size, she can be house-trained at any time. Small dogs have the reputation of being hard to house-train, but a more reasonable theory is that it's easier to tolerate a puddle that's roughly the size of a quarter or poop with similar dimensions to a tootsie roll than a gushing river, or worse.
From a dog's perspective, she feels discomfort so she wanders into a room and squats. She wasn't caught in the act and she experienced a positive outcome - relief. As long as this is happening regularly, your dog is well on her way to a lifetime of eliminating in the house unless things change.
Setting up for success
For successful house-training, you must remove the potential for all accidents. If you catch your dog in the act of eliminating, interrupt the behavior and take her outside to finish. When she is finished, reward her immediately with a treat or praise.
Useful tools: crates and tethers
If you can't closely watch your dog while indoors, then she must be crated or tethered. Dogs will try not to eliminate when crated, but if the amount of time they are left kenneled exceeds their bladder capacity, accidents will happen. If need be, come home during your lunchtime or hire a dog walker to let the dog outside.