Just Adopted My New Baby From The Shelter However, She Had These Scars On Her Side, Anyone Know What They Could Be From? (also featuring an adorable photo)

I just adopted a leopard dog/ pittie named Bumble Bee and she is the light of my life! I do suspect she was used for breeding in some manor considering she is fairly young but has tons of loose skin and filed down teeth. My and my partner are trying to figure out what object could have possibly made this burn scar on her side, it’s such an odd shape. I hope it wasn’t purposely but I fear it maybe.