Therefore, the spaying is often blamed if a puppy begins to put on weight. If you do not overfeed your pet and give her plenty of daily exercise, she will not gain too much weight. If you don't, she'll get fat, whether or not she's been spayed. During the stage in the heat cycle when a female is receptive toward males, she may attempt to escape from the house. It is quite common in pets that are very dependent on their owners, and can occur even when no mating has taken place.
Some females go through a false pregnancy every time they come into heat.
A very troublesome side effect of having an unspayed female is the necessity of keeping her away from unwelcome Romeos and keeping them away from her. Males will appear on your doorstep, hang around your yard, and fight one another. You think your pet is in pain and take it to the vet only to find out it is in heat and looking for a mate. At around six or seven months of age, your male will become sexually mature. The operation is best performed when the animal is young, although it can be done at any age in a pet's life.