Reasons why your dog may be defecating in his crate relate to behavioral issues, physical limitations, or medical reasons that can cause your dog to be unable to hold his bowels until he is let out of his crate. Often, conditions that cause diarrhea or a loss of bowel control can result in crate soiling.
Potty Training
If your dog is still a puppy, he may not be completely potty trained. He may also be too young to be able to hold his bowels for too long of a time. Puppies will need to relieve themselves much more often than adult dogs, and can even need to have a bathroom break as soon as every hour. On average, a two month old puppy can only hold their bowels and bladder for about two hours at the most. As your puppy grows older, he will be able to extend that time, but it may be slow. Know that even an adult dog can have limitations, and may not be able to hold their bowels or bladder through an eight to ten hour work day.
Crate is Too Big
Ensuring you have the proper size crate can also make a big difference. When choosing a crate, only allow enough room for your dog to be able to turn around in and lay with his legs out. This important detail will ensure that there isn’t enough room for him to defecate and not lay in it. Dogs have a natural instinct not to soil where they rest, so use this instinct to your advantage, especially when training puppies, or retraining adults.
Anxiety
A dog who suffers from separation anxiety may become quite anxious when you leave, a common time when he may be crated. He may whine, pant, and pace, but more importantly, he may become so distraught that he may defecate right where he is. Your dog might also suffer from confinement anxiety, which could cause anxious behaviors when he is trapped in a confined space.
Inflammatory Bowel Disease
This is a chronic condition that affects the intestinal tract in some dogs. Due to several reasons, the intestinal lining is invaded by inflammatory cells, resulting in an allergic response that interferes with the ability to process and absorb nutrients from food. Common signs include episodes of diarrhea or vomiting, and sometimes, weight loss. Diet and bacterial proteins have both been identified as possible causes.
Infections
Various infections can lead to digestive problems that can cause uncontrollable diarrhea. Parvovirus is a highly infectious virus that can cause severe abdominal pain, bloating, decreased appetite, vomiting, and often, bloody diarrhea. Many types of internal parasites and worms can also cause digestive disruptions, and can result in chronic diarrhea that can damage the muscles in the rectum. This can lead to a loss of full control in that area. Some of the infecting parasites can include roundworms, hookworms, tapeworms, giardia, and coccidia.
Muscle and Nerve Disease
There are various diseases that can affect the muscles or nerves, causing weakness and debilitation that can affect rectum function. Degenerative myelopathy involves a degeneration of the axons within the spinal cord, resulting in arthritic-like symptoms specifically seen in the hind end. Peripheral myopathy is a condition which causes nerve damage that inhibits sensations, thereby stopping your dog from knowing when he needs to defecate. Myasthenia gravis is a neuromuscular disease that is inherited or immune-mediated. This condition stops the muscles from being able to contract.
Incontinence
There are many medical conditions that can cause incontinence in dogs, especially those that involve a partial or complete paralysis of the hind end. Elderly dogs may also experience incontinence as a consequence of aging, and this is likely treatable to a certain extent.
Trauma
Injury can occur from accidents, or from tumors that may have formed near the rectum. These kinds of trauma may damage sphincter control and make it difficult for your dog to control his elimination.
Medications
Certain medications can cause disturbances in elimination. If you have noticed the behavior since your dog has been taking a specific drug, talk with your veterinarian about the possible side effects and if that may be causing problems in your dog.