This might sound strange, but it’s seriously: tennis ball bombs are a real thing, and also they can cause serious injury or even death to people and dogs alike.
It’s best to totally prevent any type of unusual ball when you’re out and about– not only around July 4th, however anytime. Better safe than sorry.
People may or might not be purposely targeting dogs with these bombs, but it’s hard to fathom why someone would go to these lengths to create something so potentially deadly and horrific. Either way, simply keep in mind to do on your own and your dog a favor and stay clear and also report anything suspicious to the police.