we have a 7 year old brindle boxer. he has always been very healthy and still is. He has a golf ball sized knot that has developed on his chest. We had our vet check him out. He called it a fatty mass.He said it shouldn't be anything to worry about and told us to keep an eye on it.It doesn't seem to bother him at all,but it is visible.
That sounds about right, my old GSP is as healthy as a horse, but has a couple of fatty masses on his chest, if it bothers you get them removed, watch them if they get hard and fixed, rather that soft and moveable you need to take him back to the vet.
my c ocker spaniel, Sneakers, may she rest in peace, had a lump too. hers was in the shoulder blade area. I took her to the vet and he said it was a "fatty nothing" too. less then a month later that fatty nothing turned out to be cancer. i had the tumor removed and Sneakers had radiation treatment. 2 years later it came back. Please have that fatty nothing removed. if only i had done that when i had the chance. please have it removed.
A dog is the only animal that can love you more than it loves itself.
I work with a breed that is very prone to fatty masses as well. We always have them checked of course, but thus far it's never been anything to worry about. We also see them as dogs age, not as youngsters. I personally have never taken them out as i dont see the need to be intrusive if it's nothing and has no affect of any kind. Just my personal experience