dogs love SUP (mine really enjoys driving around on a board; he's happy because he doesn't need to swim

)
well, i've drive around many dogs on differend SUP boards (dogs form 6 to 40kg). I have to say, that inflatable boards did the best job for dogs!
1. not so "slippery" on the nose; no need to wax it for a dog
2. not many scratches on the top (because of claws)
3. a bit more volume in the nose
I have a bigger dog, 35 kg. First year we were cruising on rigid 10 footer (32 wide). I have to say it was a bit tippy with this beast on. One day friend's dog (40kg) had a go with me on this rigid 10 footer; he was sticking with his claws so hard that he schrached the nose and pad.
This year I switched on 10'6''x32 RED ride inflatable and we both really enjoyed cruising around. I barerly feel that I have 35 kg beast on the board, stabile and fun. My dog also loves it as it is not so slippery and tippy on the nose as his ex board. I was surprised, i found RED paddle SUP "claw scratch proof".
if you will SUP with a dog on most of the time go wide. 33 or more. Especialy with 65kg dog on it. 65kg is a lot!
Take a look on Starboard inflatable astro collection 2015. Or RED paddle co sup boards.
Beware of materials you choose, if you will pick up inflatable, take a look at the construction, layers; thicker "layers"/skin are/is better for your needs.
Cheers!:)