[Nancy1999]

When Joey gained too much weight after a tricks training class, the vet recommended cutting the food by one third and adding green beans in it's place. The green beans act to fill them up, so they won't have hunger pains, but are low in calories. You could cut about a tablespoon of food a day, and give about 5 green beans. I use the frozen variety thawed, because unlike the canned they contain no salt, and Joey loves them. Weighing weekly helps, and look for about an ounce a week loss, adjust food as necessary. Instead of a snack before bedtime I put 5 pieces of kibble aside and give it to Joey as a bedtime treat. I also make him play fetch for his morning meal, throwing a toy and having him retrieve it for one piece of kibble, and half his dinner is given this way. Keep others from giving him treats too.

You might want to do a vet check; to be sure it's not water weight, that's an awful lot of weight in one month.