simba

I got Simba from Pasco Shelter, he is a red nose Pit, great dog I have never had problems with him whatsoever, since the minute he came home he felt at ease, i have cats and a smaller dog, no issues at all. I have grandkids from ages 3 months to 6 years of age and they all play with him. when i adopted Simba i was told that he was 6-7 so he should be about 10-11, however I think he is older. the problem is we have had 2 incidents with a neighbor, she is an older lady and has recently rescued a Pit as well and Simba has attacked her dog twice, without reason...... due to this my husband no longer wants Simba. He has mentioned that he is taking him back to the shelter and I am scared that he will be put down.