Sending you my deepest sympathy at this sad time. He must have been a very strong and determined man to be with you for a year longer than you expected, and it must have been tough, but very precious time for you both.
A celebration of his life sounds like a lovely thing, you will have so many lovely memories from over your years together.
It is such early days, be kind to yourself and do not take too much notice of negative comments people make to you. Sometimes people just do not know what to say when someone dies. Get rid of your dogs is the last thing you would want to do, and if ever gets tough to walk them there are always dog walkers that can take them for you.
I hope you have family and friends to support you at this difficult time, sending you a hug x