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The vet suggested that we changed diet for our dog.

Is 'changed' fine? Or it would be better to use 'change' or 'should change'?

Many thanks.
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Yoong LiatThe vet suggested that we changed diet for our dog.

Is 'changed' fine? Or it would be better to use 'change' or 'should change'?

Many thanks.
'suggested that we change' or 'said that we should change'
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The vet suggested that we changed diet for our dog.
Oh, no! You don't want this one. The other two are the correct ones -- not this one. Suggestions are somewhat like weakened imperatives, so you typically use the bare infinitive, the same as you would use for the imperative. This is regarded as the subjunctive form by many grammarians.

Change your dog's diet! (imperative)
He suggested that we change our dog's diet. (subjunctive)

Or should change, as you also mentioned.

CJ
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Thanks, Philip.

Is The vet suggested that we changed diet for our dog correct?
 CalifJim's reply was promoted to an answer.
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Philip
Yoong Liat
The vet suggested that we changed diet for our dog.

Is 'changed' fine? Or it would be better to use 'change' or 'should change'?

Many thanks.

'suggested that we change' or 'said that we should change'
Or "suggests we change".
Thanks, guys.