The ideal weight of your dog does depend on his/her breed although there is rarely one ideal weight for any single breed.
So how can you tell if your dog is carrying more weight than is healthy?
Place your hands on either side of your dog’s rib cage. You should find you can easily feel each rib individually. If you can’t then your four-legged friend is most likely overweight. On the other hand, if you find each rib is too pronounced or even protruding then your dog may be underweight instead.
The next step is to look at your dog from his/her side. Is the abdomen tucked in slightly? While this will be more visible in some breeds, your dog should have a waistline to some extent. An overweight dog won’t have a waistline (and in some cases the abdomen can drag somewhat) while an underweight dog will have a more pronounced abdomen tuck.
Feel for the bone at the base of your dog’s tail. You should find this relatively easily if your dog has a healthy weight.