I'm so sorry that Dusty has to go thru
this at such a tender age.Sounds like the new
Vet. just gave the 'standard advice',the wait
and see approach..
A second opinion by one of the other Vets
at the Clinic would probably help ease your
mind about the lump, and would not reflect
badly on the first Vet.
Will say prayers and hold Good Positive
thoughs for You & Dusty !!!