Sudden sexual aggression in 14 month old neutered male cat, scrotal sacs not completely empty - possible medical causes?

I have a mother and her 14 mth old litter, all neutered at 4 mths and vaccinated for outdoors, but 95% indoor cats. Two weeks ago the smallest male suddenly started mounting his biggest brother. I pull him off and hold him down for a bit when I catch him. Also started to treat him as the alpha (feed first, special attention, extra treats) to discourage the need to reinforce his dominancy. However, he targets other siblings now and the attacks have been gradually increasing in frequency and duration (up to 10 min. if I don't intervene as victim will growl but not fight him off). Never sprayed, never howled, but checked his scrotal sacs yesterday and felt a chili bean sized hardness in each not present in his brothers'. Vet appointment next week but am worried sick. Anyone have similar experience/idea as to cause? Googled hyperthyroidism, adrenal cancer, but so young. Other symptoms: eats much but slim, very active/increased vocality lately, went next to litter box for a while months ago

Asked by Member 1148246 on Jan 4th 2013 in Health & Wellness
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Best Answer

Ajaxx Anthony Fisher

He may have what is known as a crypt orchid meaning one of his testicles was left up inside him & wasn't removed when he was neutered. It's not very common but not as uncommon as one would think. Your vet may have removed a lymph node & thought it was his testicle & that's why a "normal neutering" was recorded. My mama volunteers with a rescue group & she adopted out a cat that had had a crypt orchid & started spraying & mounting at 13 months. They had him neutered again & it was fine for a few months when he started up again. They did a hormone test & his testosterone was really high (it should've been non-existent). Turns out he'd had TWO crypt orchids so God only knows what the vet allegedly took out for his first neutering 'cuz it certainly wasn't a testicle. The third neutering was the charm & the family loves their sweet boy! Have your vet do a hormone check - your boy might need a second neutering. Good luck!

Ajaxx Anthony Fisher answered on Jan 5th.

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