My puppy is in jail for no reason!!

Ok so my baby Naku got locked up for sumthing he didnt do. My neighbor says he bit their little chihuahua dog, but hes not agressive n any sort of way. I have 2 nieces 4 and 18 months old and he never bit them and they bother him all day long. Also 2 guinea pigs and 2 cats, why hasnt he bit them? So now i have to go to court and prove hes not agressive, but of course their not going to believe me because hes a pit mix. But I will be getting him back thank god i dont know what i would do if i didnt. Even tho its guna cost me like $700, because they wanted to take him. I think they should pay for it not me. I didnt say "here take my dog so i can pay you $700 to have him back in a month." The pound is completly outta control. Plus my other neighbor kept callin animal control on him so they took him for getting out a few time to. But when i call animal control about their VERY AGRESSIVE dog getting out of their yard almost everyday and biting my 18 month old niece they dont do a thing!