It's going to be hard to think of twenty. I feel like I am pretty simple when it comes to dog stuff. But I'll try (in no particular order).
1) My Mesamis collars. They're so soft, come in limited slip or a plastic clip, tons of colours, and the reason I bought them at all is because no collar marks! I have so many collars, but I find I only use these ones nowadays because they really don't ruin my dogs' coats or create lines. And they're a nice, thin width.
2) My clicker. Specifically my StarMark clicker. The little blue and orange one. I love that thing.
3) Orijen Freeze Dried Treats. Not good for Agility or target training, cause they crumble, but I like using them for Dance at Flyball and they're my go to for at home. Healthy, stinky, the dogs love them.
4) Zukes Mini Naturals. Kind of boring, but super convenient and I can make a bag last a long time by breaking each treat into three.
5) My Rush To Tug leashes. I love them for easy on/off. They're so handy. And nice and soft and super cute. They're my first martingale slip leads and I love them.
6) Leather leashes in general. I have a whole bunch from different companies, but as long as they're broken in and no wider than 5/8", I love them all.
7) My little orange Metro force dryer. Never again will I have hairy dogs without one.
8) My Chuck-It. For lazy days when I just feel like exercising one dog at a time quickly (except Keira, who thinks fetch is stupid lol).
9) My Dremel. No clicky nails here! I thought mine broke last year after I accidentally dropped it and I was so sad lol. It is a huge necessity.
10) Crates. I don't know how people live without them.
11) Boomerang CollarTags. Because no noise! I bought pretty jingly tags and never used them. I like silent collars.
12) Martingale collars with buckles from Nearly Naked Neckwear. So much easier to use than traditional martingales! I hate having to readjust collars constantly.
13) Kongs. I don't use them as much as I should, but when I remember to, I love them (and so do the dogs).
14) West Paw Design's Hurley and Bumi. So durable! Mine are so old now and not even a little dent.
15) Giant fluffy tugs. Keeps my hands mostly safe from my fuzzy black shark, and she loves them.
16) Cushy dog beds. I hate pacing, and fluffy beds give my dogs a place to go, cause they like to complain about hard surfaces.
17) My ChillyDogs coats and sweaters. I like how much body they cover while still being super flexible/allow for easy movement. I wish the price were a lot better though.
18) My thinning shears. No toe and ear fuzzies here! Not allowed haha.
19) My Ruffwear backpack. It didn't get any use this year because Journ was still growing, but I will definitely be using it next year. It fits so well and has lots of room for reasonable items.
20) A toss up between Northern Biscuit cookies and Puppy Love Duck Feet. My dogs get one or the other almost every morning when I leave them.
There! I made it to twenty haha. I could live without many of those items I am sure, but those are all of my favourites that I could think of off the top of my head.