Not long if you can hack it into your day! If you find it difficult to fit training sessions into the day, try using the ad breaks on TV. Each time ads come on, practice 'Down' with the dog.
It's best to give your dog more opportunities to relieve itself, especially if it's prone to bladder infections. When the dog needs to hold its urine for a long period...
So, there are all these nerves running through your spine. If you have any trauma or muscle inflammation, it can pinch those nerves and cause some irritation. Lying on your...