My dacshand only has gone into heat once and I thought that they go into heat evey 6months

Most dogs reach sexual maturity by 6 months. It can vary from breed to breed and from dog to dog.

If your dog is only 1 year old then one heat cycle isn't unusual.

This is the perfect time to get her spayed to avoid a pregnancy.

My little girl didn't have her first heat until she was 11 months old.
We got her spayed at 12 months.