12 1/2 Y.o. 5# Chihuahua/poodle Mix With Nasal Lymphoma (dx

12 1/2 y.o. 5# chihuahua/poodle mix with nasal lymphoma (dx via bx) 14 mos ago. Lg lump on same side on neck. Still eating and many times perky. Today yelped twice when barely touched. Wondering about progression. Possible external surface erosion starting. Not following the course I read about. (No discharge, bleeding,msneezing) Don't want her to endure pain just because she seems to be acting okay.