Veterinarian
Vet
noun, の adjective
One who does beast medicine is a veterinarian, taking care of all them animals.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
あの獣医さんに行く一番のメリットは、もちろん先生が優しくて賢いってこともあるけど、それだけじゃなくて治療費を分割で支払えるのよ。
Going to that veterinarian has the best benefits. Of course he’s kind and intelligent, but not only that, you can split up your bill into separate payments.