Q. Our 6 yr old Pitt retriever mix got a small mast cell tumor removed from her chest 3 days ago. Today she has a rash near the incision site, thoughts?
A. Mast cell tumors tend to release histamine to the tissues around the tumor, sometimes that can cause itchiness and rash around the wound, even bleeding called Darier's sign. If they removed enough tissue around the tumor calm down and go tomorrow to your vet that possibly will give you some tablets to improve that reaction, normally steroids.
A. She may have reaction to stitches, cleaning solution which is used pre and post surgery. If she managed to lick or scratch the wound it is also possible that she made it sore this way. If the irritation get worse you should take your dog back to your vets for examination.