As most of us have a strong connection to all that is the natural world we will have at least one familiar. Here we have 2 dogs, 2 cats, 2 rabbits & 3 chooks in our household however only the 1 of the dogs is my familiar. My last feline familiar was a short haired black domestic cat with a few white patches she died a few years ago now at the age of 16yrs. Although we have a virtual menagerie of animals not all of them are familiars to me.
One of the rabbits isn't a familiar to anyone, she is not friendly at all and she is completely blind even though she is only 12months old but she is still a part of the family and here for life. The other rabbit loves my children (all of them) and is very much considered their familiar, one of the cats has decided my partner is her human and the other cat lives here, eats here and sleeps here but owns no one here or owns everyone here depending on how you look at it. The chooks love anyone who has the seed jug hehehehee.
For most of my pagan life cats have been my familiars but this time after my feline girl died a little black puppy (Sheppard/pointer cross) made her way to our household and she became my next magical assistant and collaborator. Miss Lucy is now 2 1/2 years old & enormous but still very much my little baby girl. We have another Sheppard cross here who is also very attached to me but more a separation anxiety response than a familiar.
Any animal can become your familiar it will depend of what you energetically need at the time of asking for one. Sometimes they just show up and in these cases there is something you can both learn from each other more than you learning something from them. There are many responses on google regarding the meaning of the animal that appears for you or that you seek however I find it is better to just accept they are there and that they are willing to help you on your journey.
Check out the tabs in our spells & rituals section to call &/or protect your familiar, to call your familiar the best time is the new moon however as with all energy work when you have the need all times are good times.