Upset- New dog went after my other dog

 Sometimes even a fosterer thinks it's normal for a rescue dog to protect its food, especially if there was a history of food deprivation, but in any case, those issues should be tested for (using an assess-a-hand or stick) before the dog is transferred to a foster home.  If someone is going to run a rescue, they should be knowledgeable as well as good hearted.   I do like the idea of treats from both hands, so long as you don't make any mistakes.  That helps to change the dog's perception at least to your resident dog's presence being a predictor of food, rather than a competitor for it.

sweet226

I'm sure in the foster home they would have had some sort of issue with him before over food. 

Can you contact the foster? If they had indeed dealt with this before with him, they may know better what does and doesn't work for him. There's also almost always a 2 week to a month adjustment period for dogs that have gone from a foster situation to being adopted.

Also, in defense of fosters everywhere... be aware some of this issues never do come up in foster homes.

Also, it's entirely possible that the foster home never had the dogs together, near food. At my house, new dogs are completely seperated for at LEAST a month, in the presence of food. I know, already, that my adult dog will SLAM another dog if she thinks it's going to take her food. After the new dog is fully integrated into the household, and has some training under it's belt, I will start with some low value treats, together (everybody sit! everybody gets a tiny peice of raw carrot) and work up from there.