I am from Canada and have a registered Canadian Mare. My problem is that shortly after I purchased her I noticed a pocket that was under her ear. When I touched it alot of thick pus came from it. I cleaned it and the next day it was back again. It resembles (excuse the expression) snot. It doesn't seem to be painful but is terrible looking and sometimes has a foul smell. I believe it to be a dentigerous cyst. Unfortunately, had I been told about this problem upon purchase, I could have had it repaired sooner. I had my vet look at it and the vet sedated her to have a look. The vet did not feel comfortable exploring any further, so she closed the hole and said to have her looked at elsewhere. My question is has anyone had this problem before and what am I looking at as far as costs go? Also, I live in the Sudbury-North Bay area and would like to know where would be the best place to take her. She is my pride and joy and she is like a big happy dog. I really want her fixed and comfortable.