"I didn't used to pke keeping pet dogs" 是表达过去不喜欢养宠物狗的正确说法。
"used to" 是一个常用的短语，用来表示过去的习惯或状态，例如：
I used to play the piano when I was a kid. (我小时候曾经弹钢琴)
She used to be shy, but now she's very outgoing. (她过去很害羞，现在很外向)
另外, 这个句子可以用这样的方式来表达：
I wasn't a fan of keeping dogs as pets in the past.
下面是一些例句：
I used to hate going to the gym, but now I love it. (我过去讨厌去健身房，现在却喜欢了)
He used to smoke, but he quit a few years ago. (他过去抽烟，但几年前戒了)
I didn't used to pke spicy food, but now I can't get enough of it. (我过去不喜欢辣的食物，现在却爱不释手了)