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My name is***** and I am sorry to hear that Biscuit is having such a difficult behavior change. Based on your description, I am very concerned that he may have canine cognitive dysfunction (doggie Alzheimer's). He likely is not aware of his house soiling or of his constant barking. Punishment is not going to help and is only torturing him more.
Here is a link to an in depth discussion of this horrible end of life problem:
Please take this information to your regular vet to discuss it further. These dog's are not fully aware of their surroundings and they often have a poor quality of life.
Another possibility, if you feel his awareness is still very good, is does he have a bladder infection, diabetes or Cushing's disease? These diseases can make the dog's uncomfortable and also have inappropriate urination. This is more that you can discuss with your vet.
Best regards, ***** ***** this answer helps you.
Feel free to contact me if you have any more questions.
Kansas State University,
College of Veterinary Medicine Class of 2001
How is Biscuit this evening? Did you have a chance to speak with your regular vet about checking his urine and blood, as well as discussing the possibility of canine cognitive dysfunction?
Do you have any more questions for me?
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