Is it OK to walk my dog in the rain?

Sure it is. Actually dogs like to splash around in the rain, especially in labs and golden retrievers. Of course, the problem will come shortly after you return home all wet and with shades of mud. Small sized dogs may dont like rain because it makes them wet and dirty. 
Get a cheap raincoat, your umbrella and your pet and enjoy a rainy walk without worrying that it well get sick.

Why doesn't my dog eat?

Dogs all over the world have two main needs: Food and games.  When they don't feel like eating, something is wrong. Here are 3 main reasons that may be responsible to lose their appetities.

1. They don't like the food. If you have switched from chicken to lamp or fish, or changed the brand, the dog shouldn't always like that. Try to mix some old with the new food so that the dog will get used to it slowly.
2. The dog is ill. Monitor your pet's behaviour and if he doesnt want to eat as well as play then take him to the vet. Senior dogs are most likely to lose their appetite.
3. They are stressed or sad. Many reasons make a dog unhappy: A bad behaviour from us, a change of environment, a person's or another pet's loss in the family, separation anxiety