yes it is possible but if i were you i would of taken her to the vet but only if she is acting strange , in pain , or if her belly is still kinda big.
No it can vary :) Some dogs have only two while others may have four or five puppies. It depends on how old the dog is and other stuff too......
Yes! Well, at least that is what they say so YES they are the only one and it is contagious to other dogs.
Fish will not get lonely as such, but many fish naturally shoal with other fish and will therefore feel stressed if alone. You should research the species you have and find out what its needs are. .
No,dogs come in a lot of different colors