I am using one of my pets as a gourmand pet and is it possible to raise how hungry he gets? He gets full so quickly, this making the journey of food pet very long one.

Unfortunately, not really. There's which you have to use in battle with a different pet, and it can randomly affect one of your pets' hunger. But it won't necessarily affect the pet you want it to and it requires you to have at least a tier 6 pet to use it with. Not worth it, imo, you're better off just waiting it out.

Keep buying food and stashing it somewhere to feed your pet whenever they're hungry, though. You get through it faster than you think

I respectfully disagree. I think the glove is worth it!

When it does make your pets hungry (besides the pet battling with it), it affects all other pets. I feed, on average, 90 foods a day using my glove and getting up to level 27/28 in my Battle Quests. I've been able to go from 2,930 foods on 10/2/15 to 4,999 foods today.

If you have the patience to do the battling, it can be worth it.

I suppose if you have a tier 6+ pet that's not also your gourmand, and 13m to spend on it, and you're in a hurry for gourmand, it's nice to have the option.

I still don't personally think it's worth it, but I also stopped caring much about gourmand after 5k

Thank you :)