I have a 19 month old intact Chesapeake male. He has been trained for hunt test competition since he was a puppy. Obedience is good. He is a hard charger, high prey drive, smart with lots of stamina. He comes from high quality field trial lines with well known parentage. Both parents are house dogs as well as trial.
Over the past months as he entered adolescence, he has developed dominance related aggression (or so I believe) and food related aggression issues. He has never shown any aggression towards other dogs or other people. In fact, he is very outgoing socially, and is not at all possessive of his toys or nylabones. He was well socialized as a pup, with both people and other animals. I live in Los Angeles, so he has been exposed to a great variety of environments, and does well in them all.
At about 15 months of age, I noticed one evening that he was limping/pacing, holding his front paw up off the ground, favoring it heavily and obviously in discomfort. When I went to examine his paw, he growled at me -- he would not let me near the injured leg/paw. It appeared that his paw pad was torn, but I couldn't get a good look. He licked it all night in his crate, but by morning, he was no longer limping and was walking fine. I assumed that it was injury/pain aggression that had caused him to growl. I now realize that by backing off in response to his growls, I failed to show leadership and taught him that he could manipulate me as such.
At 16 months of age, he was on his dog bed (in living room, not in his crate where he mostly lives) but with his head up and alert. I approached him and bent over to pet him. He stiffened as I tried to push him over to pet his stomach, and then growled. Without any physical form of control over him, I backed off and tried to diffuse the situation by calling him to the door and making him sit as if to go out. He did so with his tail wagging. I put his pinch collar on and did some easy heeling, praising him for his good work, and then I put him in a down-stay on his bed (in hindsight, a poor choice). I misread him at this point, assuming he was fine in his down-stay, but he obviously was not -- still very stressed, breaking his stay and trying to run past me towards his crate. I was sitting on a footstool and gave him a verbal "eh!" for breaking, and as he passed me, he got "trapped" by furniture and he responded by biting my arm. Again, I now realize my many mistakes in this event -- bending over him to pet him when he didn't desire it, trying to push him over, backing off when he growled, etc.
Believing it to be a dominance issue, I responded by upping the level of general control over all aspects of his general life (already a very controlled life) and continued to further reinforce the established pack structure in daily life (he "earns" everything). Basically, except for exercise and training (field and obedience), he was mostly in his crate, so I had no idea whether these efforts were helping the issue or not as I did not test him in the same situation that prompted the bite.
I also began collaring him to a post on a table and touching him all over. At first, he was not comfortable in this restrained position, but has gotten much better and now enjoys it. Initially, when I lifted his front paws, he would begin to show warning signs -- nose twitching or body stiffening. I taught him to "shake" with both paws with food rewards and he now has no problem with me handling his paws (he was touched and handled regularly as a puppy to prepare for vet exams, etc.) So there was some progress in modifying his behavior.
My layman thinking is that this behavior is a combination of an adolescent male challenging my authority along with perhaps a negative association from the prior injury which triggers it (when he growled at me with pain aggression, he learned that he could control/dominate me in that situation).
Recently (at 19 months of age), we returned from a long day of field training. As is customary, I fed him in the corner of the kitchen, with him sit-staying as always before receiving his meal. Because he had started to show food aggression by stiffening or even growling a bit when I got close to him, I just leave him alone as he inhales his meal in 20 seconds or so. In this instance, I reached over behind him for a paper towel and inadvertently pushed a chair into his rear, pushing him aside. He stiffened and growled and I immediately backed away (he was facing away from me as he ate). As I did so, I knocked over an empty plastic trash bin that was sitting in the kitchen. He then growled much louder, turned away from his partially eaten meal, and came around the table at me (maybe 10 feet from his dish). I was able to kick the trash bin into him to slow him down, and then grabbed a vacuum cleaner to put between us. I sent him to his crate and he complied.
Obviously, this is a serious situation; I am well aware of that. Opinions range, but the consensus is that he is exhibiting dominant behavior, testing my place in the pack structure. Regarding the food aggression, I believe his breeding is sound, that he was fed properly as a puppy, and I have never messed with his food as he ate, other than always making him sit stay while i put the food down. I've been around the breed for a long time and such behavior (testing, not biting, as well as tendencies to resource guard) is not uncommon for a Chessie adolescent, but this situation is new to me and is clearly unacceptable. The food aggression issue can be managed by feeding him in his crate, but that won't eliminate the underlying issue.
I live in a very small home and do not have children. However, I do have a fiance that is not a dog trainer, and I certainly do not feel comfortable putting her in a position of managing a dog with such known issues, even if for only a day when I'm out of town.
I'm interested in the "foundation" approach to such food related aggression and dominance related aggression issues.
Thanks in advance.


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