I have pinned Gary down about vacation plans. No vacation until the dog dies. No vacation for both of us, that is. I can go some place on my own, if I "must." I'm afraid I must. Actually, Gary should go on vacation for his health, but the dog's health is paramount.
First off, in some ways that makes everything much more economical. No dog boarding fee. No Gary airline fee. B&Bs are an option. Cold weather is an option. Renting an apartment for a few days is an option. Taking taxis. Gentleman Hosts.
I think any trip alone would need to be shorter. I wouldn't want to be gone a week. But Maine in August sounds very fine.