@roo2018
He’s has no health problems other than allergies. He will be 2 in November. The aggression has just worsened overtime. It’s obviously fear related, I can see the fear in his eyes and i watch it turn into aggression. He’s a large breed. It’s not easy to manage at all but my main concern is his lack of quality of life.
I know cats are different to dogs, so this is a long shot.... (skip to the end to avoid my long, boring, possibly totally irrelevant anecdote).
One of my girls, who I love beyond all reason, became ferociously aggressive about 8 months ago. She lives indoors, and would wildly attack my other cat and my partner and even me if I was the only person around. It was horrible - we ended up putting tall pet/baby gates up around the apartment to separate the cats at all times. My partner wouldn’t go near her and I know that he was concerned about the long term future. She remained loving and playful when alone with me, but could turn into a teeny 3.5kg monster in a split second.
I spoke to loads of vets and an animal behaviourist and In the end they recommended a number of drugs, starting with Prozac, which is supposed to be very effective with fear aggression in both dogs and cats. Once you get the dose right your pet should be exactly the same, just without the anxiety that triggers the aggression. I was uncertain, but willing to try (desperate) but it turned out to be impossible to get her to take the tablets.
BUT - my cat also has allergies, that predominantly affect her skin. We would normally get her flare ups treated with steroids whenever a sore appeared. Over lockdown I found myself trapped in the UK (I live in France) with my cats, and I took her to see a different vet who suggested a different, daily drug to suppress her immune system and stop the allergic flares completely. It has completely transformed her life. I think she must have been living with a constant low level of discomfort almost all of the time - she is so happy now! (And three times this week she has spontaneously crawled into my partner’s lap - after months of hissing and spitting at him, so he’s happy too).
Sorry, long post. Really just to say:
Make sure you fully rule out any physical cause, however minor seeming.
Do consider medication. I was really sceptical about the idea of Prozac but did a lot of research and there are a lot of success stories out there (both for Prozac and other drugs) - although it is no quick fix and would need to be used in conjunction with training / behavioural work.
My heart goes out to you. This is so hard. I wish you all the luck and strength in the world, wherever this journey ends.