Nah,not anymore.I have two big goofy Pittbulls,they don't actually bother the train,but when they start to play,if they accidentally ran into it,it would be dust.They never go near the tree other than to smell it,but my wife starts to play with them,sometimes she gets carried away,LOL!! It's funny..Seems they know it's something special.I just lost my male,Samson,a few months ago.He's give it a sniff,look at me,and wag his tail.
A funny story..My buddy came to my house with his wife..[Not the sharpest hammer in the drawer..] It was August..She looked at my model railroad,and says:"Where do you put the tree?"