How old is Izzy?
When Coby was a puppy for the first few weeks we had him, we had a lot of laundry even though we were very dilligent about potty training and he did really well with it. We washed blankets because he pooped in his kennel and we washed his little bed because he'd pee in that. I'd say that, assuming it's not due to any other issues, they're no different than accidents and, as long as training is going well, they will pass.
