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Join Date: Dec 2008
Location: Alberta Canada
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Feed both dogs separately, so there's nobody bothering your older dog. Also, put the food down, wait 15 minutes, and take the food away. Nothing till the next meal, and no more than 2 meals a day. I wouldn't try adding in goodies, switching foods, giving him attention for not eating or eating either - just put the food down, come back and take it away after time's up.
If he thinks you'll add gravy, or treats, switch foods or give him attention for not eating, he'll continue to do so. My own dogs have tried this from time to time and have no problem eating better the next day.
Now, if after doing that for a week he's still not eating much I'd suggest a full geriatric blood panel to see if there's anything going on, but seeing as it's at the same time as a puppy coming into the house it's likely his nose is out of joint. Might be an idea to have some time alone with him each day as well, when puppy is napping.
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