Thank you growler and rgeurts,
It is nice to have support here when you are feeling down.
I'm sorry about Thorin Rgeurts. Yes, 12 is a very good age for a dog that size. There is a malamute here that we often see on our walks and he is 9 but really slowing down. His owner mentioned that he hopes he makes it to 10. I hope he does! Timber has more siberian but she is not a pure breed. They say for a siberian the lifespan is between 12 and 15.
I just want both our dogs to have happy senior years. I'm one of those people who always likes to try and prevent things and have been especially watchful so it is hard to feel that I didn't catch this sooner. I always thought Timber would have more trouble because she has always struggled with allergies, arthritis and the tick disease didn't help. I think she generally has a lower immune system than our other dog who is two years older.
As long as they happy and not in pain we will do our best to carry on. It is hard to imagine my life without them though.