Behavior & Training
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Behavior: Unhealthy Obsessions in Dogs
Light Chasing

Question: My 1 1/2-year-old neutered male English Shepherd developed a fascination with light and shadows about nine months ago. He chases any reflections he sees, and on cloudy days even does the chasing behavior in places where shadows usually appear. He will stand outside under a tree and watch shadows of leaves blowing for 20 minutes at a stretch. He is an inside/outside dog and gets at least an hour walk each day. The behavior is not destructive, but I worry about the total attention he gives to it and I certainly don’t want it to become worse.  What should I do?

Answer: Fascination with lights and shadows is most common in high-energy, high-drive dogs, and most of the cases I’ve seen have been in herding or hunting breeds who have come from working lines. As in your dog’s case, it often shows up in adolescence. It is wise to be concerned, because this problem seems to escalate if left to its own devices, and I worry that it may already be affecting your dog’s quality of life. Many dogs who start with a little chasing of shadows can degenerate into cases of full-blown obsessive-compulsive disorder. If that happens, additional compulsive behaviors may develop. Because of the potentially serious nature of this problem, it is worth having your dog evaluated by a veterinary behaviorist in your area who understands anxiety disorders. Also, a change in diet sometimes helps dramatically and is worth a try.

Prevention is a critical part of helping to extinguish the behavior, so whenever possible, keep your dog out of situations that elicit it. Obviously, you cannot eliminate lights and shadows from your dog’s life, but even simple steps such as hanging dark curtains, spending time with your dog in the rooms with the fewest lights and shadows and temporarily storing particularly reflective items can help.

Your response when he begins to chase or fixate on shadows and light will have a big impact on his behavior. Let your motto be “Interrupt and redirect, but never punish.” Interrupt the behavior and try to redirect him to some other sort of behavior. Try to distract him with a favorite toy or use a new squeaky toy to get his attention. Consider rattling his leash and heading out for a walk if that works to distracts him. (Don’t do this last one too often or he may learn to chase shadows in order to get you to take him out.) The interruption should distract your dog, but should never scare him. Good options for redirection include tug, fetch, the ever-popular Kong®, a chew toy, outdoor exercise or a training session. It can be tempting to respond in a negative way to this behavior, but any punishment carries the risk of making the behavior worse.

An hour walk each day is enough for many dogs, but additional exercise for a young, active dog so interested in light and shadows is really important. Off-leash running for an hour or more a day (or better yet, twice a day) can really make a big difference, as can tiring activities such as fetch and swimming. I realize that finding safe places to do this is often the biggest challenge. Physical exercise can greatly help this problem, but so can additional mental exercise. Giving your dog’s mind more to do may help as much as the physical exercise. Give him toys that tax his brain, teach him tricks daily, or attend classes.

If you feel that his obsession is worsening or is more noticeably affecting the quality of his life (or yours!), consider talking to a qualified veterinarian about medicine for obsessive-compulsive behavior and working with adjunctive medical therapy such as Chinese medicine or homeopathy.


This article first appeared in The Bark,
Issue 35: Mar/Apr 2006

Karen B. London, PhD, is a Bark columnist and a Certified Applied Animal Behaviorist specializing in the evaluation and treatment of serious behavior problems in the domestic dog.

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Submitted by lynsey | February 1 2012 |

Hi, I would be very grateful of ANY help advice etc, I have a doberman cross who I got from the pound 4 months ago, I already have a 2 year old cross terrier, both dogs are fantastic together, I walk them 3 times a day long walks too, I live by the sea in Spain so they are very lucky and looked after well, My problem started last week, when I let my doby cross off the leash she has started running frantickly up and down the beach barking at the waves and stepping in the water, she wont come back to me or listen to any coommands!! why has this suddenly started and does it sound like ocd??? shes been walking along the beach every day for 4 months without any problems, they are both fed on a complete dry food and this i vary from time to time
thanyou for any help

Submitted by Anonymous | March 5 2013 |

I have a 7 month old golden retriever who just recently started to obsess over shadows and lights. This started almost immediately after my family was forced to put my other dog to sleep. Do these things correspond with one another? Should we be worried?

Submitted by Angela | June 20 2014 |

I have a Pit/Border Collie who stares at lights that come off our phones shadows anything even lighters she'll stare for hours and gets excited but just stares for the longest time it gets annoying because you grab your phone and she'll stare at you with such a dumb yet focused look what do I do is she just special?

Submitted by Linda | June 23 2014 |

I adopted a 9 yr old Westie about a month ago. She is wonderful and a terrier for sure. However, she has started obsessing chasing and barking at the squirrels in our backyard. Too, when we are on a walk, if she sees a rabbit, she will try to take off after it (no surprise) but then it is very difficult to get her to "leave it" and continue the walk. Her jaw and whole body tense up.

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