Have you tried changing his diet? If you're feeding him a food with lots of grain and fillers, he might not be getting the meat proteins he needs.
He will also need something to chew on to set his teeth firmly in his jaw -- also, it is relaxing to lay back and have a good chew now and then.
Is he getting lots of long walks? Is he trained well on a leash? Does he pull to get at frogs and birds, or can you distract him easily enough and get him to trot along at a comfortable pace?
A vet might be able to tell you if there is something physically wrong with him, it is always a good idea to rule that out.
Excess weight gain can put a lot of strain on the reproductive system, too. Though physically he may look like a plump, darling puppy to you, his body might be experiencing some problems as a result.
And, of course, we have to consider the possibility that there's a degree of boredom setting in. Dogs left alone for long periods of time suffer from separation anxiety. He may be engaging in destructive behaviors simply because his mind is not being exercised and stimulated. Dogs tend to get BORED with their toys -- it is suggested that owners repeatedly take away toys, put them in storage for a while, bring out new ones, then rotate through them again. This is more exciting for a bored dog.
Now, I hope YOU realize that while I'm having fun with this, I also gave you GOOD advice in the form of a rather bland, though somewhat satiric metaphor.
Think it over and if you want, come back and tell us what you think is REALLY wrong with your relationship.
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