I have three Chihuahuas , Cosmo (the oldest) i have had for 5 years than we got waffle (she was a present to my husband) and they had puppies by mistake, I kept one and gave the rest to family after I got ALLLL of them spayed and neutered! So I have Cosmo Waffle and Panda and they got along just fine for forever and now all of a sudden they are all being aggressive towards each other. This is what happens, if one growls a little bit the one near it will start a fight ... that is pretty much it. I treat them all with love , they always get treats have food and water go outside play with toys and now all of a sudden they are being aggressive. Why?
It just started happening waffle is spayed so she is'nt in heat it seems more like a jealousy thing.