I had 2 beautiful Labs. I personally think that chemo, just prolongs the suffering. Your dog is going to be extremely sick during chemo!!! I don't think I could watch my dog go through all that, but that's my personal opinion. The cost would be quite substantial, & then there are still no guarantees.
It's better to remember how happy he was, then to remember all the chemo & suffering he went through.
I know this is a very hard decision to have to make & im so sorry, that you have to make this decision!!!