Our girl Emma was recently diagnosed with a Osteosarcoma in her shoulder. She is a 7 1/2 year old, 75 lb Labrador, she began her journey when a noticed a slight limp. I checked her foot and leg and could not find any problems. She had recently come back from the vet and was undergoing meds (Baytril) for a UTI. Literally three days later after her slight limp, a swelling appeared on her left shoulder about four inch in diameter and raised about an inch. Emma was at our vets office, a few days later. Our vet x-rays the area, a firm mass on her shoulder and we opted for a needle biopsy also to the scapular area. I asked if the mass could be from an injury (hoping) and was told he did not think so. Well results of the fine needle came thru yesterday and our worst fears were confirmed. It was an Osteosarcoma in shoulder and he felt was deep into the bone. He recommended a visit to a surgeon for further evaluation, which we will be seeing in a few days. Emma is eating normally, moving about maybe slightly less than her usually habits. Still shows that slight favor to her left front leg when walking. She seems about normal, maybe I'm looking at her too much. She sleeps through the night. I try to limit her trips outside for her business and her exercise as she has to climb the stairs in our house. She is getting her exercise. There are two other dogs in our house a Labrador and a Beagle (who thinks she is a short Lab) and she keeps up with them as usual running and playing. 

What should I be concerned with at this point, question to ask my vet? thanks for listening Dan