The fabric's properties makes it very hard to penetrate, protecting against slashes of sharp objects and prevents bites. Very few items can penetrate our fabric, but please note, bruising might occur on the skin from impacts. The fabric we use is design to prevent to be slash proof, e.g. protect against punctures to the skin, but the fabric is not designed to absorb the impact of the entire force, for example bruising may occur if there was a situation. The fabric used is similar to that in bulletproof vests, which has more absorbing properties than our coats. These are heavy and not flexible, which is impractical and are designed to absorb high impact objects like bullets. If you have any worries if your dog has been involved in an attack or something similar, please consult your vet immediately.