I have two 13 month old lab cross puppies and they play fight all day long. Well they live in an underground electric fence area and are kenneled at night. When they were around 6 months old they started chewing each others collars off at night in the kennel. We tried to keep collars on them for a little while but gave up and took the collars off at night. When we put the shock fence in we were careful not to leave the collars on while locked up because they are $100 each. These collars have heavy duty plastic straps with the plastic shock box on them. Well one of them broke last month and it was under warrenty still so they sent us a new one but it had a different strap. 2 days after wearing the new collar it came off or something and they chewed it up breaking it. Because it was a faulty strap they sent us another collar. It took 3 weeks to come in because it was on back order and one of the dogs didn't have a collar during that time and didn't try and break out. Well 3 days before the new collar came in the male dog chewed just the box part off the working collar leaving it on the female dog but breaking the box. Grrrrrr that's $100 down the drain. Now neither have working shock collars on them and it's only a matter of time till they figure out they can get out. We got the new collar in 2 days ago and are going to buy another collar to replace the chewed one. We have been scared to put the new collar on because we can't aford to have it broken also. I rubbed Tabasco hot sauce all over the broken collar and put it on the dog. Those stupid dogs liked it and went around licking it!!!!! Then I tried soap, same story!! What is something dogs hate the taste of to keep them from chewing? We are going to try the bitter apple spray they sell but I don't have high hopes of it working. I need help because we will have together rid of one if this doesn't stop, we can't afford it.