There's a good vet in Bavaro, although I don't know his name (maybe PJT can help you...). My Sto. Dgo. vet recommended him for when I move to Punta Cana. In Sto. Dgo. you can give a call to the following vets to see if they can help you:
Dr. Marino Piantini (tell him Katia recommended him)
ofic. 540-7106 cel. 309-3128
Clinica Vet. Dr. Pi?eyro
566-1020
Clinica Vet. Dr. Peguero
565-9235
These are 3 that I can recommend. You can get many other tel. # searching in
www.paginasamarillas.com.do and entering veterinaria and the city.
Good luck and I hope it ends up being a false alarm!