Quote: Yes, I told him I wanted to be there to help. Said he didn't want any help, same thing he did with the other dog.
Annette, fellow petlover {{{hugs}}} for your loss. I think there is miscommunication. When you said you wanted to help, I'm guessing that you weren't necessarily indicating that you wanted to shoulder a shovel and dig, but that you wanted to be there for the process, both as a comforter and as a griever. Your husband probably thought only of "help" as a part of the physical labor involved.
When he said he didn't want any help, a further statement explaining that you wanted to be there so that you could feel and/or express your sense of loss would have been clearer. If he attempted to stake claim to being alone during the process, then pointing out that you have been impacted by this loss as well would have been a next step.
If you made it clear that you wanted to be there for yourself and not just as an assistant in the labor and he chose to circumvent or ignore that, then you do have a clearer cut issue.