I have a 7 month old Newfoundland female. I've notice her front right legs shaking sometimes, now today she's limping on it. Does anyone have any ideas what is going on? Please any advice would be greatly appreciated.

Not being able to see the dog, and the shaking legs, no, can't give any ideas as to what is going on. That is a lot of dog, a working animal which needs lots of exercise, likes water.

Are you in a hot climate ?

Think you may have to have her checked over by a vet. Is she up to date on her vaccinations ?

Large breed dogs are very prone to joint disease and dysplasia. You should be speaking with your vet and possibly take some x-rays. Not too long ago a great dane puppy came in with the first starts of elbow dysplasia. So your dog is not too young to have symptoms start