Do I still need to report income even if I don't receive a 1099? (Ex: Walk dogs for Rover, but don't earn enough to prompt a 1099-k)

You still need to report the income you received.  For the self-employment income you can use section for Cash.

See this TurboTax support FAQ for Self-Employment income - https://ttlc.intuit.com/turbotax-support/en-us/help-article/self-employment-taxes/report-income-self-employment/L5wADi3xQ_US_en_US?uid=lcqp92ev

If you had even $400 of self-employment income you are required to file a tax return and pay self-employment tax for Social Security and Medicare.  And you do not need a 1099 to do that.  You can enter the income even if you do not receive a document.

https://ttlc.intuit.com/questions/2926899-how-does-my-side-job-affect-my-taxes

https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/26653

https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922

https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax

https://ttlc.intuit.com/questions/1901340-where-do-i-enter-schedule-c

https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct

https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs

If you do not want to pay for the expensive online Self-Employed software, you could try using the IRS Free File site when it opens later in January.

-Use this IRS site for other ways to file for free.  There are 8  free software versions available from the IRS Free File site

https://apps.irs.gov/app/freeFile/

you should expect a 1099-NEC with the exact amount of your pay, not a 1099-K.

@marc-damico1