That's pretty funny seeings that I never told you to rehome your bunnies, birds and hamsters that your dog killed. My bettas are happy and healthy and I am just one of a million people that have set ups like this.
I had my rabbit housed in my room, free most all day, and kenneled at night in a big kenel.

The birds that my dog killed were wild.

The hamster my dog killed was like years ago.. It was in a tank on my brothers floor with no lid. *accident waiting to happen.. The rabbit is the only pet of mine that my dog has killed.

I know you are just 1 of a million ppl who have your bettas in a jar but you can be one of the millions that have on in a tank if you like. They are much happier in tanks. I had 2 bettas that just died like a couple of months ago from old age. They were in two gallon tanks.

2-10 gallon tanks are sufficant. Just advise but you dont have to listen to me..

And I got this info from google.