Could you post some clear close-up pictures of the leaves? It would help us to see exactly what you're talking about. I don't think the dog marking it would cause any major problems.
[url=https://www.helpfulgardener.com/forum/viewtopic.php?t=3724]How to Post Pictures & Photos on forums[/url]
"Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?" - Douglas Adams