Great dane haves bump on and is she normal size?

i have a female great dane 8 months old 80 lbs she haves a bump on one side of her size is half of base ball fells like fluid inside almost like water ballon she also looks like she getting one on the other side of her we live in the woods . will take her to vet. mon. she is 80 lbs.8 months old is she normal size