I purchased the short-lived previous version of this product,
Dremel 765-01 Pet Nail Grooming Kit, and liked it so much that I bought the Dremel 7300-PT for friends. There are two differences between the 765 and the 7300- the casing of the 73000 is gray, and Amazon charges $29, rather than $32.
The newest version of Dremel's Pet Nail sander is well worth the money. It has changed what was previously a tortuous experience into something quick and easy.
I did some research before buying the 765 and 7300, and ended up choosing these over other products for several reasons.
PediPaws Pet Nail Trimmer- Several friends had bad experiences with it, generally finding it to be of poor quality.
Dremel 7700-02 MultiPro 7.2-Volt 20,000 RPM Two-Speed Rotary Tool with 50 Accessories- Although this is more powerful, it is also more expensive, heavier, larger, and louder, which would make it difficult to use on my nervous pet.
Dremel 761-03 Cordless Pet Nail Grooming Rotary Tool- This is the older version of the 765; the primary difference is that this required AA batteries. Because several people complained about having battery problems I decided to go with the updated version.
I made the right choice! I have a large pitbull who has dark nails, hates having anything done to her feet, has very long quicks that are fast to bleed and slow to stop, and wiggles and refuses to stay still when she is nervous. I have tried clipping her nails, filing her nails, and even taking her on long runs on rough ground to wear them down. This is by far the best solution.
I began by letting her see and smell the sander, and then running it over her body and feet with the power off. I then turned it on and held it away from her, again letting her hear, see, and smell it. I had treats at the ready, but she was fine. I held it near her for several minutes while on, and then touched the non-sanding end to her body so that she could feel the vibration. No problems. In fact she bent down to smell it, and pinned the sanding band between her face and my hand. We both jumped, but no pain or damage to either of us. Although I was prepared to stop if she got tired or nervous, she was so good that I was able to do all four paws. It took about 15 minutes, but with lots of "good girl" and belly rubs interspersed she was fine.
The sander itself is relatively small and light, making it easy to hold even for long periods. It is easy to put together; it comes with a small wrench to put new sanding bands on. Unlike its predecessor it comes with a rechargeable battery and charger. When sanding, even on high, it is fairly quiet and vibrations are minimal. The body of the sander was warming a bit after 15 minutes, but I noticed no heat in either my dog's nails or the sanding band. In addition the battery was still going strong. My sole complaint about this product is minor; the LED light on the charger lights up to indicate a connection between the battery and the charger, but doesn't change color or go off to indicate when charging is complete. The instruction book indicates that a full charge should take approximately 3 hours, so that's what I've gone with. I had to recharge it after about the fourth or fifth use.
I gave the Dremel 7300 to a friend, and she's used it on her two German Sherpherds and her cat, with similar success
This is a great product for nervous animals and/or owners, as it's almost impossible to do damage with, and allows easy care for an oft-neglected aspect of your pet's health.
**Update 10/19/11:
After about a year of ownership the Dremel is still my go-to tool for trimming my dog's nails. My only complaint is that the battery is not holding its charge nearly as well as it originally did. With one full charge I can usually get through a full sanding on all four feet, however by the end the power is running low, and I don't doubt that soon I won't be able to do all four feet at once. Despite this drawback I still highly recommend the dremel for those who want an alternative to clipping their pet's nails, and when the battery on mine dies for good I will definitely be investing in a new one.
**Update 2/16/12:
The battery continued to get worse, so on a whim I called dremmel. Apparently there is a 2 year warrenty on this sander, so I mailed in the sander, battery, and charger for them to test. I was a bit nervous about just sending it off, but about a week later they sent everything back with a new battery and it's working great.