I have. I bought it before we brought Maverick home. He didn't want it or need it as the warming/beating heart toy. I just let him have the dog. I feel like it wasn't really well put together and eventually the velcro holding the heart and rice bag in (that's what you warm up-and can reheat instead of throwing away) got unsticky and eventually fell apart. The stitching on the dog's paws and nose started coming off and became hazardous. The dog had to be thrown away. It was like a human grade stuffed animal for puppies. It was a good concept, just very expensive and not worth the price.
When we got Bear I went to Wal-Mart in the baby section and bought a little stuffed bear with a microwaveable pouch for $10. We still have it and it's still in perfect shape. I think something like that might be a better option for you.