Can I get default judgment if the Defendant fails to Answer my Amended Petition?

In many states you may move to default based on the failure to answer. You should check the precise rules in your locale and follow them. You will have to give notice to the defendant of your intent to bring default motion seeking a judgment. Then, at the default hearing, it will be up to the judge to decide whether under the circumstances a default is warranted.

Because the defendant answered the original, at the default hearing the judge may allow the defendant some more time to answer the amended one, too.

I hope this observation helps.

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In Texas, generally, a default is taken when a defendant never appears and answers a petition. Once the defendant appears and answers, the court will not enter a default. Often, a defendant in Texas court will answer amended petitions to assert particular defenses to newly asserted legal claims.

The above is not intended to be specifical legal advice. Please consult a lawyer for specific advice.