Depends on if neighbor is deed restricted and the restrictions allow for recourse against their animals causing nuisance. If not contract pest control company and have them put flea barrier along neighbor's line
I have lived in the Tampa area for my entire life of 58 years. I have never had to deal with someone else's fleas. I would normally say to treat your yard; however consult your pediatrician first. In this situation I see no choice but to report them to your board. Sand fleas should just be at a beach.
Ask the neighbors if they need flea meds and offer to buy a months supply. Regardless you're still going to have fleas this is Florida State everything lives here
Sand fleas are everywhere
Spray your yard
Get a fence or have your yard treated.
Spray your own yard. Florida has Flea's
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