Preterite Meaning Changes: Querer and Tener?

Question

"Querer" in the Preterite means "tried", or if negative (with 'no') then it means "refused". But what if I wanted to say "I wanted it in that moment."? For example:

"As I was walking I came across an ice cream shop. For an instant I wanted ice cream, but then I remembered my diet."

Because there was a specific instant that the ice cream was wanted, could the Preterite be used here?

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"Tener" in the Preterite means "got/received" - is this correct? But what if I wanted to say "I had it for X years."? For example:

"I had that dog for 10 years."

Because duration is stated, could the Preterite be used here?

Thank you!

Answer 1

The "imperfect" tense is correct in both cases. If you switch to the preterite in either case you get the alternative meaning which you don't want.