Focused Dog Alarm
This is minor project but useful. We were having problems with one dog sneaking around and leaving a mess is a specific spot. A ping sensor and BOE solved the problem with a little noise when something stepped into the exclusion zone. The ping worked better than a PIR because it could be refined to allow passage closer and further away to avoid false alarms or discourage them from areas that were ok. So if you problem with the dog jumping on the furniture but you don't want to spook them otherwise this might be a simple solution for you. Basically, one line to a ping and two to a speaker.
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What size is the dog? How far away will it detect the dog?
I'm asking because the smaller (and fluffier) the dog gets, the more difficulty the ping would have. It seems you are only detecting when the dog gets very very close, but I'm curious if you know what kind of reliable detection range you have. I'm sure for big dogs you have almost the maximum range, but I wondered about smaller dogs.
Apparently PIR sensors work pretty well too, if you constrain the sensor's detection range. (I haven't tried it yet, I have a PIR sensor in a bin somewhere, I'll get to it later.)
See this cat deterrent apparatus:
http://www.youtube.com/watch?v=uIbkLjjlMV8&feature=youtu.be
I faced a similar challenge (to protect my property for an invador) and from my tests I realized that a very good choice of sensor (for focused and small distance detection) is the IR Transmitter Assembly Kit in conjunction with the Infrared Receiver
This solution is efficient in order to detect a moving object with distance 1-70 cm from the sensor. In my opinion the best advantage of the IR comparing the PING sensor is the low power consuption, that is very important for a remote alarm system.
However is my case I must detect a thief from a remore place on my parent's farm in a large area (more details are coming soon) so I used the PIR sensors.
For wild animals, you may want to look at the frequencies they hear before choosing an ultrasonic. Some wildlife like bats can hear the 40K signal.
For wild animals, you may want to look at the frequencies they hear before choosing an ultrasonic. Some wildlife like bats can hear the 40K signal.