Asking for extra money for not-as-advertised dogs?

I noticed that you don't even have a puppy rate for boarding. Why is that? I would never expect a 6-month-old puppy to be reliably housebroken. A higher rate is for all the work and the additional cleanup taking care of a puppy might entail.

You have a puppy rate for drop-ins and walking, which is lower than for an adult dog, and I am not sure why.

I have had this happen multiple times. We kindly let the owners know that, often times, dogs of all ages will have a change in their habits/manners when introduced to a new environment. Let them know the puppy's "incontinence" (don't say "lack of potty training") results in more costs for clean up supplies to keep the dog safe, sanitary, and comfortable. Add an adjustment to the price or, better yet, adjust your "Puppy Rate" to accommodate your costs when/if this happens. I've even used the "Puppy Rate" for incontinent senior dogs as well.