I'd think so, PTSD is PTSD no matter the species. The first months with my dog (who suffers from somewhat similar issues) were very hard on my own condition. As we've grown to know each other and get very comfortable around each other, not only did the worsening of my symptoms subside, but he actually makes me feel a lot better most of the time. There are still times I deal with severe anger and put him outside while I clean and get it out. Then I let him back in and he slows my heart-rate and helps with my panic attack (which always happens after dealing with the rage). So, in my experience it gets better after enough time. I don't think it's that way for everyone, though. You need to give it enough time to make your own judgement.