Depending on where you live, ponds also may attract anything from raccoons to cows. If you live in a rural area as I do, you have to think about stray dogs even if your dogs are perfectly trained. In addition, you have to think about other domestic and wild animals. Even cats can be a problem. They like to walk around the edges and may fall into the pond.
Cat claws are death to pond liners.
There are several ways to protect your pond from unwanted animal visits. Basically, you have to figure out a suitable barrier. A thirsty animal will overlook most any odor to get a drink. One easy thing to do is to have an alternative water source for wildlife. That's a good thing for the animals and the pond.