Want to mulch w/ coffee grounds but worried about the hound.

We have access to tons of coffee grounds, and I would love to use them as mulch in our garden beds. However, we have a black and tan/blue tick and I'm worried she might get into them and poison herself. Here's the facts: We're in the city(bad place for a hound I know, but she gets out a lot), so whenever she's outside off a leash she's with one of us supervised in our yard. She's unbelievingly respectful of our garden beds even w/out a fence. She even takes the time to detour around the beds when making a beeline for a critter. The only thing that will tempt her curiosity is the oh so yummy bonemeal we use occasionally, but even then a loud HEY!! gets her out of there. I know I could just fence it off, but I'm super happy w/ the ease of access we have now, and don't want to drop any cash(hence the free coffee mulch dilemma). So, any thoughts? We love our pup, and her safety is our first concern, gardens are second. Thanks.

I usually toss the coffee grounds out the back door when I'm done with a pot. The dog will run over sniff them if he sees my throw them. He's never shown any interest further in them, but I only put out a pot's worth at a time and I don't mix them with other things he might consider food.

If you have food scraps or good smelly compost mixed with the coffee grounds, she might be more likely to eat them.

I have used about a ton of grounds this year, in a garden where a dog lives. I've never seen him eat anything and he's still alive.

Are dogs supposed to be attracted to coffee? I knew about chocolate and antifreeze.

I've been dumping the daily grounds on the maple grounds right off of the deck.
Dogs sniffed them at first, but quickly decided that there was nothing of interest to them there.

The worms sure love them though. The other night, we had a bit of drizzling rain, and spotted dozens of mating pairs on the surface of the mound.

Thanks for the responses! Sounds like you guys haven't had any issues, I guess that means a green light on coffee mulch. I do add loads of vermicompost, but she has never shown much interest in that, only the bone meal added here and there. Also, the coffee would be mixed in w/ whatever mulch I would have on hand. Usually shredded leaves/ wood chips. The combo of all three should keep the heaps of worms and other soil life we have churning happily. In retrospect I thought to myself, the caffeine is supposed to be the toxic element for dogs. Since the grounds are leached, wouldn't the caffeine be less of an issue? Meaning if our fuzzy friend were to chomp on some, it would take a decent amount to pose a risk. She does love to find snacks on the ground.