"They do not love his dragon."

Translation: Zȳhi zaldrīzī jorrāelosy daor.

[Draxximor]

Why not jorraelzi?

[Ctxkh1Me]

Negative statements use the subjunctive form:

The basic way to negate a verb in High Valyrian is to end the sentence with daor, a word you've seen before. The only trick is that the form of the verb changes when negated. In Valyrian, a verb changes its form from the indicative to the subjunctive when negated

Ref: https://www.duolingo.com/skill/hv/negation/tips-and-notes